Kent Police said the attack happened shortly before 09:00 BST when a "substance" was thrown at the victim at Ian's Plaice, off Thanet Way in Whitstable.
The man was taken to hospital with facial injuries following the attack. His condition is not yet known.
No arrests have been made, a police spokesman said.
In a similar incident on Friday, a man was left with injuries to his eyes and face in a reported acid attack in Salford, Greater Manchester.
A man has been injured in a suspected acid attack at a fish and chip shop in a seaside town in Kent.