The invention discloses an electric small brush, which comprises two half brush bodies, namely a left half brush body and a right half brush body. Unevenly arranged brush hairs are arranged on the outer surfaces of the two half brush bodies, a motor is arranged in the two half brush bodies, a motor shell is fixedly connected with the inner surface of the left half brush body, and a counter weight is combined at the end of an output shaft of the motor and is fixedly connected with the inner surface of the right half brush body. The electric small brush disclosed by the invention has the advantages of small volume, lightness, convenience, practicability and reliable structure; and by means of a micro-action cleaning form of the high-speed small motor, the breakage of large action on the surface of an object to be cleaned can be reduced, dirt at inner dead corners of an appliance can be conveniently cleaned, the fatigue of work staffs is lightened, the cleaning effect is better, the cleaning efficiency is high, and automatic cleaning can be realized; and the electric small brush disclosed by the invention is suitable for cleaning the interiors of devices, such as humidifiers, various-shaped vases and the like.