Electric grinding machine

The utility model relates to an electric grinding machine which comprises a main body, a motor and a battery are correspondingly arranged at the upper end and the lower end of the main body, a control device connected with the motor and the battery is arranged in the main body and provided with an on-off control button and a rotating speed control button, and a grinding device is installed on an output shaft of the motor. The polishing device comprises a front buckling piece and a rear buckling piece which are buckled with each other, and a polishing wheel clamped between the front buckling piece and the rear buckling piece, the front buckling piece and the rear buckling piece are fixed to an output shaft of the motor through mounting holes formed along the axis, the polishing wheel comprises a supporting ring, and dense steel wires are arranged on the supporting ring; each steel wire is arranged in the radial direction of the supporting ring, a polishing contact formed through bending is arranged at the end,