Automatic clutch device for seeder transmission

The utility model discloses an automatic clutch device for seeder transmission, which is capable of improving the seeding operation efficiency, is convenient to maintain and is low in manufacturing cost. The automatic clutch device comprises a transmission shaft and a return spring sleeving the transmission shaft; a driven clutch can be axially matched with the transmission shaft in a sliding mode; the other end of the return spring pushes the end surface of the driven clutch; a ground wheel supporting arm can sleeve the outer side of a fixed base in a swing mode; a drilling bit jaw of a driving clutch and a drilling bit jaw of the driven clutch are meshed; a swing arm sleeves the outer side of the driven clutch in a rolling mode; a separation jaw arranged on the swing arm and a static jaw arranged on the fixed base are meshed; one end of a driving rod is perpendicularly and fixedly installed on the ground wheel supporting arm; the other end of the driving rod is perpendicularly inserted into a long hole. The automatic clutch device can be installed on a seeder to control the automatic separation of a transmission system.