The research aim of this passage is the control system of the coin sorting apparatus. The passage mainly discusses the design of coin sorting machine’s control system based on DSP, meanwhile, mainly explains the design of the seizure of counterfeit coins with eddy current sensor, the coin counting with photoelectric counter and the stepper motor micro-step control system, etc. By the coordination of every module, we achieve the functions of sorting, packaging, and picking out the fake from a pile of mixed coins.