The work aims to design a mechanical device for automatic sorting and packaging of coins based on the coin size and quality, so as to facilitate the separation, sorting and packaging of coins. Under the control of single chip microcomputer, a large number of coins were scattered by the coin entry module, the coins were separated by the coin sorting module, and the power was delivered to the coin entry module and coin sorting module above by the transmission module. Finally, the coins were arranged and packaged by the coin collection module. The whole system achieved the orderly separation, sorting, counting and packaging of the coins through control. Coins could be automatically dropped into coin bins to achieve automatic packaging and sorting of coins. The coin packaging and separating machine has the advantages of simple operation, high precision and high speed, and can meet the needs of the market.