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为了解决原有供电系统越级跳闸事故频发的问题，本文基于数字式光纤电流纵联差动保护技术对煤矿供电系统防越级跳闸保护进行设计，给出了数字式光纤电流纵联差动保护技术工作原理及优越性，同时对硬件及软件的设计方案进行研究，对优化后的供电系统进行应用发现，优化后系统的安全性得到了有效的提升，同时无越级跳闸事故出现，标准矿井供电系统安全运行。“,”in order to solve the problem of frequent override trip accidents in the original power supply system, this paper designs the override trip protection of coal mine power supply system based on digital optical fiber current longitudinal differential protection technology, gives the working principle and advantages of digital optical fiber current longitudinal differential protection technology, and studies the design scheme of hardware and software, Through the application of the optimized power supply system, it is found that the safety of the optimized system has been effectively improved, at the same time, there is no override trip accident, and the standard mine power supply system operates safely.