The invention discloses an automatic sorting device for coins. The automatic sorting device comprises a PLC control system, a power mechanism, a funnel buffer mechanism, a single-layer baffle mechanism, a color separating mechanism, a chute separating mechanism, a counting mechanism and a packaging mechanism, wherein the power mechanism is driven by a motor; the funnel buffer mechanism comprises a buffer vane wheel and a funnel; the single-layer baffle mechanism comprises four buffers; the color separation mechanism comprises a color sensor, a guide rail, a stepping motor and vane dial wheels; the chute mechanism comprises a collection funnel, a guide chute and a separating chute, and the separating chute is formed in the guide chute; the counting mechanism comprises a correlation type photoelectric sensor; the packaging mechanism comprises a crankshaft slide block mechanism, a coin collection cylinder, a belt cylinder wheel disc, a coin collection cylinder feeding box and a penetration type linear screw rod stepping motor. The automatic sorting device is complete in functions, high in efficiency, simple in structure, convenient to use, high in practicability, capable of accurately separating coins and easily popularized and used.