Sewage tank assembly and ground cleaning equipment

The utility model relates to a sewage tank assembly and ground cleaning equipment. The sewage tank assembly comprises a sewage tank body and a sewage tank cover body, the sewage tank body comprises a cylindrical tank body of which one end is open and the other end is closed, and a sewage accommodating cavity is formed in the cylindrical tank body; the bottom wall of the sewage containing cavity protrudes upwards to be provided with a sewage recycling pipe, a bottom end opening of the sewage recycling pipe is communicated with the outside, and a top end opening of the sewage recycling pipe is communicated with the sewage containing cavity; the sewage tank cover body comprises a cover body covering the opening end of the cylindrical tank body, and a cover body opening communicated with the sewage containing cavity is formed in the cover body; the periphery of the cover body opening is provided with an arc-shaped sealing ring, and the arc-shaped sealing ring is used for abutting against and sealing the bottom en