Sanding machine

The utility model discloses a sanding machine. The sanding machine comprises a machine shell; at least part of the motor is arranged in the machine shell and used for providing a power source, and the motor comprises a motor shaft rotating around the axis of the motor; the fan is connected with the motor; the eccentric element is driven by the motor, and the eccentric element is provided with a central axis which is separated from the axis of the motor; the bottom plate assembly comprises a bottom plate, a supporting piece used for supporting the eccentric element and a supporting seat used for installing the supporting piece, and the supporting seat is fixedly connected with the bottom plate; the conductive path between the motor and the base plate is provided with an insulation structure capable of realizing electrical insulation so that the base plate is insulated relative to the motor. According to the sanding machine, the insulation structure is arranged on the conductive path between the motor and the b