Constant-speed cruise control system and method of tandem type hybrid power tractor

The invention discloses a cruise control system and method for a tandem type hybrid power tractor, and the method comprises the steps: obtaining the operation information of the tractor through a vehicle control unit, and judging whether the tractor can enter a cruise control state or not; if the operation information meets the preset constant-speed cruise condition, a cruise enable switch is activated to enter a constant-speed cruise state, and the current vehicle speed serves as the cruise speed; when the vehicle is in the cruise control state, the vehicle control unit receives an operation trigger signal from a driver operation system to adjust the cruise speed, reset the cruise speed and quit the cruise control state; power reversing is started in the constant-speed cruise state, the tractor is still kept in the constant-speed cruise activation state, and the tractor continues to conduct constant-speed cruise in the opposite direction after power reversing. The operation efficiency of the tractor is impro