The traditional explosion-proof diesel engine automatic protection device detection process is mostly manual operation, low degree of automation, there are more errors, and automatic protection device detection process of each system module is independent, can not be completed by time delay and system control. In view of these problems, based on the original device, this paper studies and designs a scientific, effective and accurate detection system for the automatic protection device of explosion-proof diesel engine. According to the standard table, the system detects and tests the surface temperature, exhaust temperature, oil pressure, water level of exhaust gas treatment tank, cooling water temperature and gas concentration of explosion-proof diesel engine. Through the analysis of water level, temperature, pressure, methane concentration, timing and other aspects, the action accuracy of the automatic protection device of explosion-proof diesel engine and the alarm delay time of the automatic protection device in actual work are tested.