Box body cover

The utility model relates to the technical field of liquid level detection, in particular to a box body cover which comprises a cover body and a detection assembly, an installation cavity is formed in the cover body, a detection hole penetrating to the installation cavity is formed in the cover body, and the cover body can cover a filling port of a box body. The detection assembly is arranged in the installation cavity and detects the height of liquid in the box body through the detection hole. The detection assembly is arranged on the cover body, the thickness of the filling port is large, and the filling port has enough anti-vibration strength, so that the detection assembly is prevented from vibrating along with the vibration of the box body, and the output of the detection assembly is more stable. Besides, after the detection assembly and the cover body are integrated together, only one set of mold is needed, the cost is saved, only one position needs to be sealed when the cover body is sealed with the bo