Disclosed is a method for interaxle power distribution and differential speed control for an all-wheel drive dumper. Real-time available total power of axles of the dumper is calculated by monitoring real-time output power of an electric generator of the dumper, and axle load proportions is calculated and obtained through a vehicular weighting system to distribute the total power. Then, according to the real-time power obtained through distribution, an equal-torque control method is adopted for motors of all rows of wheels and every two co-axle wheels to calculate driving torque target value input through the driving motors of all the wheels. According to the method for interaxle power distribution and differential speed control, self-adaption distribution of interaxle power and self-adaption differential speed can be achieved. The available total power of the axles is distributed between the axles according to the axle load proportional distribution so that the possibilities of slipping or idling of driving wheels can be reduced theoretically, and accordingly a large margin of loss of the power during slipping or idling is reduced. In addition, the limit value of the road adhesion can be better used, the dynamic property and the braking property of the dumper are improved, and side-slipping during steering is reduced.