Abstract: The paper analyzed characteristics of current fault of mine power network,introduced a design of intelligent protection system of current of mine power network based on PLC,described hardware and software design of the system,expounded implementation of protection methods such as symmetry current fault protection based on phase-sensitive detection,asymmetrical current fault protection based on negative sequence detection and overload current fault protection based on amplitude detection in details.The system has been applied in practice,and realizes intelligent current protection of mine power network.