Electric tool with heat dissipation function

The invention relates to an electric tool with a heat dissipation function. The electric tool comprises a shell, a motor is arranged in the shell, a plurality of heat dissipation holes are formed in the positions, corresponding to the motor, of the shell, the shell is wrapped with a movable cover matched with the back end of the shell and a handle part in shape, the movable cover elastically cooperates with the shell and can elastically move relative to the shell, and the movable cover is provided with auxiliary holes matched with the heat dissipation holes in shape and number; in the naturalstate, the heat dissipation holes and the auxiliary holes are staggered back and forth, and the heat dissipation holes are closed; and in the use state, the heat dissipation holes communicate with theauxiliary holes to allow air inside and outside the shell to achieve exchange heat dissipation. The electric tool is provided with the movable cover matched with the rear end of the shell and the handle part in shape, when th