nanoparticles according to the embodiment of the present invention is shown the apparatus 200 includes a stirrer 1 a tubal reactor 2 a micro membrane tube unit 3 which can be made of ceramic or polymer or other suitable materials an ultrasonic generator 4 a container 5 and a measuring pump 6 the tubal reactor 2 is connected with the ultrasonic generator 4 and has one outlet 11 at one end and two inlets 10 at the other end of the tubal reactor 2 one inlet 10 is connected to the measuring pump 6 the micro membrane tube unit 3 with a stirrer 1 is installed inside of the tubal reactor 2 the micro membrane tubes 3 are fixed for example by epoxy resin on two seal caps 13 that are used to seal the reactor 2 one end of the micro membrane tube is also sealed by the seal cap 13 and the other is open as an inlet 7 that is linked to inlet 10 of the tubal reactor 2 via a cavity 12 and to the measuring pump 6 via the inlet 10 the measuring pump 6 is connected with container 5 by a tube line referring to fig5 and fig6 an apparatus 300 for producing inorganic oxide nanopowder and metal nanoparticles according to the embodiment of the present invention is shown the apparatus 300 includes a tubal reactor 2 a micro membrane tube unit 3 an ultrasonic generator 4 two containers 5 a measuring pump 6 and a peristaltic pump 14 the tubal reactor 2 has two inlets 10 and one outlet 11 one of the inlets 10 is connected with the first container 5 and the other inlet 10 is connected to the measuring pump 6 that is linked to.