Abstract: In view of the imperfect protection system of a coal mine underground anti-grade tripping system, which leads to large-scale power failure in the underground, the design scheme of anti-grade tripping system in the coal mine is put forward in this paper through combining with the actual situation. The implementation process of hardware and software design for the anti-tripping system which takes the controller technology, fiber optic differential protection technology and the Boolean logic judgment technology as the core is illustrated. With the STM32F417 ARM controller as the core, the data of step tripping system is calculated and analyzed and transmitted by optical fiber communication; while with the EPEC 3724 controller as the core of Boolean logic judgment, the results of logic judgment are transmitted to ARM controller through CAN bus communication. Finally the test analysis is completed. The results show that the designed and implemented anti-tripping system meets the application requirements of the North District substation and the North seventh substation of a coal mine; the protection system is improved, with no leapfrog tripping phenomenon.