The invention discloses a reset processing method of a motor controller. The reset processing method comprises the following steps of storing working condition data of the motor controller to a target memory space; detecting whether the motor controller is reset or not; when the motor controller is reset, judging whether the working condition data exists in the target memory space or not; judging the reset type of the motor controller according to the existing situation of the working condition data; when the reset type of the motor controller belongs to non-power-on reset, judging whether the working condition data is valid or not; and when the working condition data is valid, controlling the motor controller according to the working condition data. According to the reset processing method disclosed by the invention, the working condition data of the motor controller before generating the non-power-on reset can be obtained conveniently and accurately, the operation is simple, the data obtaining efficiency is high, and besides, the reset type of the motor controller can also be judged. The invention also discloses a reset processing device of the motor controller, and a motor controller which comprises the reset processing device of the motor controller.