Abstract: In order to solve problems of inconvenient operation, complicated process and low accuracy of existing test methods of intrinsically safe power supply, a testing device for intrinsically safe multi- circuit protection power supply was designed. The device consists of adaptive voltage module and adaptive current module, control module, and has testing functions of intrinsically safe power supply and safety power supply module with 12, 18, 24 V power supply. Adaptive voltage module loads input power with rated voltage value to measured intrinsically safe power supply when tested voltage, output power end of measured intrinsically safe power supply is no-load, control module managements output voltage value of adaptive voltage module, and monitors output voltage of safety protection circuit at the corresponding levels is normal or not, so as to realize voltage testing at the corresponding levels; Adaptive voltage module loads input power with rated voltage value to measured intrinsically safe power supply when tested current, adaptive current module is loaded to output power end of measured intrinsically safe power supply, control module managements load current value of adaptive current module, and monitors output voltage of safety protection circuit at the corresponding levels is normal or not, so as to realize current testing at the corresponding levels; Control module can control switch ammong multiple protection circuit testing. The test results show that the device can automatically identify different voltage grade of intrinsically safe power supply, automatically load different power load, and can automatically warn and accurately analyze performance of the power supply, which implements automation and intellectualization of testing of intrinsically safe multi-circuit protection power supply.