Chris Norton, who is uploading the photos to Twitter account @UrineWatch, said he noticed men repeatedly using the wall at his premises as a toilet.
The businessman, based in Bradford Street, Walsall, said he was shocked to find it happening up to five times every day.
Walsall Council is investigating.
More on this story and others from Birmingham and the Black Country
Mr Norton, who uses the hashtag #walsallwee, said: "It's been happening for more than two months and I reported it to the council but nothing happened.
"So I decided I had to take action myself because it was getting very depressing to see.
"I thought it was just happening at weekends, but when I saw the footage it was actually happening up to five times a day."
Deputy council leader Adrian Andrew said the authority is looking to establish a public space protection order in the town centre to combat anti-social behaviour.
"Officers are gathering information, which includes Mr Norton's evidence, and talking to other businesses in the area and the police to determine our next course of action," he said.
"Both myself and the majority of residents in Walsall are proud of this town. We've worked damn hard to attract investment here and I'm not going to allow the behaviour of a few to cause such a stink."

Jamie Johnstone, 21, from Cranhill, died after being found with serious injuries in Balbeggie Street, Sandyhills, on 16 January.
Police have confirmed that a 25-year-old man has been arrested and is being detained in connection with the incident.
Nico Donnelly has already been charged with the murder of Mr Johnstone.
He made no plea or declaration during a private hearing at Glasgow Sheriff Court on Monday.
The 22-year-old, from Cambuslang, was remanded in custody.

Wales kick-off their Six Nations campaign against Ireland on 7 February and Henry believes they have previously relied too heavily on strength.
Despite lauding Wales for their "fabulous" World Cup performance, the 69-year old believes Warren Gatland's side are capable of more.
"There are guys trying to use their brawn rather than brain," Henry said.
Henry, who won the World Cup in 2011 as coach of the All Blacks, had a spell in charge of Wales between 1998-2002.
In an interview with BBC Wales' Scrum V Radio, Henry also had plenty of positive things to say about Wales, stating that both George North and Dan Biggar are world class performers.
"The Welsh have got very good forwards and a very good defensive system," Henry added.
"They've obviously got a good coach and the way the play for each other and what they did in the World Cup was fabulous.
"George North is as good a winger as anyone in the world, Dan Biggar is a fabulous 10, one of the players of the World Cup."
However, despite individual talent, Henry feels Wales are struggling in attack.
"But the attack game, how do they score tries? Well, they've got the players," he said.
"But as a 15 they aren't putting it together as an attacking unit and that's the challenge moving forward.
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"The Welsh defence is very good, they have world class goal kickers, but the attack has always been a bit questionable."
Henry feels the World Cup group clash against Australia provided the perfect example of Welsh shortcomings.
"I don't want to be critical, but in the Australia game they [Australia] were down to 13 players," he said.
"Wales attacked for a long time, had numbers, but didn't use them.
"So you wonder about the intelligence of the attacking game on the field.
"So I guess that is the next step forward."
A podiatrist fed up with men urinating outside his clinic has installed CCTV to catch them in the act and posted the images on social media.
[NEXT_CONCEPT]
A second man has been arrested following the death of a man outside a block of flats in Glasgow.
[NEXT_CONCEPT]
Former head coach Graham Henry believes Wales can improve their attacking play by showing more intelligence.