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For the requirements of rapid detection, versatility and scalability of an equipment product, a set of passive detection devices based on Loongson 3A3000 platform and Neokylin operating system are designed and developed. The device tests automatically according to the configuration file, which solves effectively the problems of low efficiency of manual test and big error of test result. The device has built-in CPCI matrix switch card and digital universal meter card in the CPCI chassis, The zero-slot controller uses the Loongson CPU board and installs the Neokylin operating system, eliminating the security hidden danger caused by imported products, and realizing the computer security and self-control of key technologies. The resistance detection range of the device is 0-30 M?, the test results show that 50 test points can be tested within 2 minutes, and the measurement error is within 1%. Therefore, the passive detection device can quickly realize the passive test of an equipment product, meet the design requirements, and have good reliability, versatility and economic value.