Surface cleaning device

The utility model belongs to the technical field of cleaning equipment, and particularly provides a surface cleaning device which comprises a main control unit, a machine body and a ground brush, the machine body and the ground brush are pivoted, the machine body is provided with a sewage bucket and a sewage suction motor, and the main control unit can control the power of the sewage suction motor. A liquid level electrode and a common electrode are arranged in an inner cavity of the sewage barrel; the common electrode is located at the bottom end of the sewage barrel in the height direction, and the detection end of the liquid level electrode is located in the middle of the sewage barrel in the height direction and located on the rear side wall of the sewage barrel. The surface cleaning device further comprises a liquid level detection circuit used for feeding back whether the liquid level electrode and the common electrode are triggered by sewage to be conducted or not and sending out a liquid-free trigger