Mining explosion-proof diesel engines are widely used in the field of coal mine auxiliary transport, automatic protection device is supporting safety measures. The action accuracy of the automatic protection device is an important indicator of the safety performance of explosion-proof diesel engines, however, due to the constraints of domestic testing methods, the protection device action accuracy is not due attention. Kunshan Jinhuabao type ZBC3/24 explosion-proof diesel engine vehicle protection device, for example, through the study of explosion-proof diesel engine surface temperature of explosion-proof diesel engine, exhaust temperature, oil pressure, water level of waste gas treatment tank, cooling water temperature and gas concentration, an effective and accurate automatic protection device testing system for explosion-proof diesel engines  was developed by analyzing flow control, pressure control, mixed gas concentration control and timing.