Fast-assembled closestool cover plate

The invention provides a fast-assembled closestool cover plate. The fast-assembled closestool cover plate comprises an upper cover, a seat ring and a supporting seat with clamping feet, wherein a hollow shaft sleeve is arranged at the bottom of the seat ring; the two ends of the shaft sleeve are provided with inserting holes into which the supporting seat is inserted; a control cavity is arranged in the middle of the shaft sleeve; a control key is arranged in the control cavity; the two ends of the control cavity are respectively and sequentially provided with a rotating body and a fixed part; the control key is in rotatably linkage with the rotating bodies which are rotatably connected with the fixed parts; the fixed parts are provided with clamping holes; and fixture blocks which are used for clamping or releasing the clamping feet of the supporting seat are arranged in the clamping holes. According to the technical scheme, the supporting seat is clamped or released through the transmission coordination amo