Air circulating leak detecting device

The invention relates to an air circulating leak detecting device. The air circulating leak detecting device is connected to an air circuit valve and an air circuit pipeline in an air circuit system; the device comprises a housing and an air compressor; a voltage-stabilized power module, and a first detection air circuit module and a second detection air circuit module both for displaying total air pressure are arranged in the housing; the voltage-stabilized power module is connected with the first detection air circuit module and the second detection air circuit module, respectively, and also connected with the air circuit valve in the air circuit system to detect whether the air circuit valve in the air circuit system works normally; one end of the first detection air circuit module is connected with the air compressor, while the other end of the first detection air circuit module is connected with the air circuit pipeline in the air circuit system; one end of the second detection air circuit module is connected with the first detection air circuit module, while the other end of the second detection air circuit module is connected to the air circuit pipeline in the air circuit system; the first detection air circuit module and the second detection air circuit module are capable of outputting compressed air different in pressure. Compared with the prior art, the air circulating leak detecting device has the advantages of simple structure, convenience for use, good universality and the like.