Dust cup assembly, dust collector and dust collector assembly

The dust cup assembly comprises a cup body, a cover body assembly and a switch mechanism, the cup body is provided with a cleaning opening, and the cup body is provided with a mounting part; the cup cover comprises a cover part and a connecting part, the end, away from the cover part, of the connecting part is rotationally connected to the mounting part, the cup cover can rotate to a first position to close the cleaning opening and can rotate to a second position to open the cleaning opening, and the connecting part is provided with a movable cavity; the telescopic structure is arranged in the movable cavity, and when the telescopic structure is in the stretching-out state, the cup cover is located at the second position; when the telescopic structure is converted from the extension state to the contraction state, the cup cover is driven to be converted from the second position to the first position; the switch mechanism comprises a lock catch piece, and the lock catch piece is used for promoting the cup cover to be kept at the first position. In the process of taking out the dust collector, the telescopic structure is in contact with the side wall of the base station, so that thrust is provided for the cup cover, the cup cover is promoted to rotate, and the cup cover can be closed easily.