The utility model discloses a quick connecting device for a generator of a liquid level tester. The device is used for connection and installation of a working fluid level test. The liquid level testgenerator is in threaded connection with the supporter; an opening in the left end of the supporting device enables the casing pressure sensor to be clamped on the clamp head after the casing pressuresensor is sleeved and penetrates through the opening, a tee joint on the lower portion of the casing pressure sensor in threaded connection with the clamp head is connected with the quick connectingmale valve and connected with the quick connecting female valve in threaded connection with the liquid level testing generator in an inserted mode, and a bolt penetrates through the lug handle to fixedly connect the supporting device and the clamp head. Quick connection of a working fluid level testing instrument can be achieved, meanwhile, the air tightness in the testing process can be guaranteed, an originally-installed device instrument does not need to be disassembled and assembled in the testing process, and the labor intensity of workers is reduced.