The scroll compressor casing automatic detection device based on the direct pressure drop detection method was designed, to judge whether the scroll compressor casing was qualified. The basic composition and working principle of the test equipment were introduced in detail from four aspects of testbed sealing system, parameter setting and data acquisition system, hydraulic loading system and medium given system. The method for determining leakage rate and the detection system software design were also specifically introduced. Research shows that the automatic test equipment owns advantages of strong data processing and monitoring ability, high automation level, as well as easy operation and use, so the equipment can improve the detection efficiency.