The present invention discloses a micro-control tank car air pressure test device for a railway car, characterized in that the whole micro-control tank car air pressure test device comprises a rotating mechanism (6), a sealing mechanism (9) and an air pressure detection system. The micro-control tank car air pressure test device of the present invention adopts a sensing technology to detect air pressure, quickness and accuracy are achieved at the same time, operation is simple, and use is flexible, thus the micro-control tank car air pressure test device is suitable for air pressure detection of various tank cars. The micro-control tank car air pressure test device is reasonable in design, compact in structure, advanced in craft, simple in operation, stable in operation, and high in automation degree, thus the micro-control tank car air pressure test device is an ideal device for air pressure tests of tank bodies of railway tank containers and heating systems thereof.