The invention discloses a mechanical structure of automatically sorting coins. The structure is characterized in that the structure comprises a pedestal; the pedestal is provided with a first annular groove and a motor; a motor output shaft is connected to a main shaft and a shell through a coupling; a first transmission gear and a cam are connected to the main shaft through a key; one side of the pedestal is provided with a rack; the rack is fixedly connected to a limiting device; the shell is divided into an upper shell and a lower shell; the upper shell and the lower shell are connected through a positioning device; an upper portion of the upper shell is provided with several coin grooves and a lower portion of the lower shell is provided with a first annular boss. By using the mechanical structure of automatically sorting the coins, the structure is simple; operation is convenient; the structure is suitable for coin sorting work in a family and a small shop; a sorting strategy is optimized and coin sorting efficiency is greatly increased.