The invention relates to a method capable of automatically compensating Hall deviation for suppressing commutation torque pulse of a brushless DC motor. The method comprises the steps of detecting a rising edge transient switch-off phase current of a Hall signal, comparing the transient switch-off phase current with a phase current stable value, placing in a delayed way when the transient switch-off phase current is larger than the stable value, otherwise placing in advance; detecting the rising edge transient switch-off phase current of the Hall signal, and acquiring a delay angle Theta according to an expression of the switch-off phase current and delay time t; detecting a time interval of the switch-off phase current reduced to 0 from a stable value, and acquiring an advance degree Theta

according to an expression of the time interval and advance time; making time of the switch-off phase current reduced to 0 consistent with time of a conduction phase current raised to the stable value so as to acquire an optimal delay angel Theta; deducting the optimal delay angle from a deviation angle to obtain a compensation angle, and performing compensation within a next electrical period. By the method, the commutation torque pulse is suppressed as well as the Hall installation deviation is compensated, the running efficiency of the motor is improved, and the method is simple and is easy to implement.