Frictional synchronous driving device

The utility model discloses a frictional synchronous driving device which is matched with a rear wheel of a tractor for use and comprises a fixed base assembly, wherein the fixed base assembly is articulated with a support frame; a frictional driving wheel is mounted at a free end of the support frame; an elastic pressing device for pushing the frictional driving wheel against the rear wheel of the tractor is arranged between the support frame and the fixed base assembly; and the frictional driving wheel is in power connection with an output chain wheel. The elastic pressing device controls the frictional driving wheel to push against the rear wheel of the tractor, the frictional driving wheel is in frictional contact with the rear wheel of the tractor to produce power, the power is transferred to the output chain wheel, and the output chain wheel transmits the power to a fertilizing mechanism or a seeding mechanism by a chain finally. The driving device is simple and reasonable structure, convenient to control and high in torque transmission precision, and ensures stable operation such as fertilizing or seeding, and precise agricultural implementation.