The invention discloses an energy reducer control system of a superconduction proton device. The energy reducer control system comprises a PLC, an upper computer, a human-machine interface, a distributed I/O module, a graphite block, a servo controller, a grating rule and a transmission mechanism, wherein the PLC is used for controlling an energy reducer, the upper computer is used for exchanginga complicated operation function with the PLC by a bus, the human-machine interface is used for exchanging a parameter with the PLC by a bus, and the distributed I/O module is connected with the PLC by a bus. The control system has a local control mode and a remote control mode, the PLC is used as a core part of the energy reducer control system, a dual-closed loop redundancy control system is built by PROFINET, OPC-UA, distributed I/O and servo control technologies and by combining application of a touch screen and an industrial personal computer, the system is reliable to work, is rapid in response and high in accuracy, is highly integrated and is intelligent, and the requirement of the energy reducer control system is met.