Driving system of tractor

The utility model discloses a driving system of a tractor. A diesel engine is longitudinally installed on the back portion of a tractor frame. A clutch on an output shaft of the diesel engine is connected with an auxiliary gearbox which is connected with a gearbox, the gearbox is connected with a transfer case, and a middle shaft of the transfer case is connected with a parking brake. A fan pulley at the front end of the diesel engine is connected with a driving shaft I, and the other end of the driving shaft I is connected with a power output reduction box. One end of a back power output shaft of the power output reduction box serves as back power output, the other end of the back power output shaft is provided with a drive sprocket which is connected with a driven sprocket of a transmission shaft II, a small drive sprocket at the other end of the transmission shaft II is connected with a small driven sprocket on a driving shaft III, and a front power output shaft of a turning machine is connected with a matched machine tool so that front power output can be achieved. The two ends of a transfer case output shaft are connected with a front axle and a rear axle which are provided with a differential mechanism. The driving system of the tractor is provided with six power output ports and the double-power output reduction box, the constant-current control technology is adopted in the driving system of the tractor, the power output direction can be changed according to needs, the driving efficiency is high, vibration is small, the whole tractor is light, and operation is flexible.