Abstract: In view of problem of motor power unbalance in process of starting of multi-motor driving belt conveyor which uses hydro-viscous soft starting device, a power balance control method of multi-motor driving belt conveyor was proposed. A current prediction algorithm is used to predict motor current in order to improve control response speed. According to difference between the motor predictive currents, given frequency of control pump which is connected with the hydro-viscous soft starting device is adjusted through proportional derivative control algorithm, then the motor current is changed, so difference between the motor currents can be controlled in a certain range. The field application result shows that the method can restrain excessive current of motor whether no-load or heavy-load starting of the belt conveyor, which achieves smooth start and power balance of the belt conveyor.