With development of mine assist transportation facilities taking anti-explosion diesel engine as power, its safety performance function has became a key point and temperature protection program of automatic protective device is indispensable in its factory and type inspection and daily surveillance. Based onanalysis of temperature protection test method of automatic protective device incoal mine explosion-proof diesel machinery, low accuracy of temperature controland difficult carrying in temperature protection field test are solved, which provide reference to test its automatic stop property in the future.