The invention discloses an electric brush inputting and exiting control method, which comprises electric brushes, electric brush current and state sensors, an electric brush inputting and exiting control system and electric brush inputting and exiting execution mechanisms. The electric brush inputting and exiting control method comprises the following steps of (1) monitoring total current of the electric bushes and the number of currently input electric brushes through the electric brush current and state sensors; (2) analyzing and calculating whether the electric brushes need to be input or exited or not and the number of input and exited electric brushes through the electric brush inputting and exiting control system; and (3) controlling the electric brushes to be input or exited through the electric brush inputting and exiting execution mechanisms. According to the electric brush inputting and exiting control method and device, the electric brush inputting state including the total current and the number of the input electric brushes can be monitored; the electric brush inputting and exiting actions of the execution mechanisms are analyzed and controlled; the input electric brushes always work under an optimum current density state; protection on the electric brushes is 'active'; and a motor is more automatic and intelligent.