The utility model discloses a bulldozer workload self-adaptation system, which comprises a vehicle control unit, an acceleration sensor, a rotational speed sensor and a lift cylinder solenoid valve, wherein the input end of the vehicle control unit is respectively connected with the acceleration sensor and the rotational speed sensor; the acceleration sensor is placed on a bulldozer wing plate; the rotational speed sensor is arranged on final transmission of a bulldozer; the output end of the vehicle control unit is connected with the control end of the lift cylinder solenoid valve; the lift cylinder solenoid valve is arranged on a pilot oil circuit; the oil outlet of the lift cylinder solenoid valve is connected with a multiple directional control valve. The bulldozer workload self-adaptation system automatically adjusts the load-magnitude according to the actual running state of the bulldozer, the manual operation is not needed, the working performance of the bulldozer is ensured, the working strength of operating personnel is reduced, and meanwhile, the reactive power consumption of fuel oil is also reduced. In addition, the working mode of the bulldozer is reciprocating type bulldozing operation with many instantaneous static states, big error accumulation of the real-time speed which is calculated through the acceleration sensor cannot occur, and the accuracy is higher.