Knock-off plate assembly, air conditioner shell and air conditioner

The utility model provides a knock-off plate assembly, air conditioner shell and air conditioner, knock-off plate assembly includes support piece and knock-off plate, the support piece is provided with the mounting hole, the knock-off plate is detachably installed in the mounting hole, the first side of the mounting hole is provided with the insertion port, the second side and the third side that are oppositely arranged in the mounting hole are both provided with the guide rail, and the insertion port is provided with the guide rail. The two opposite edges of the knock-off plate are in sliding fit with the corresponding guide rails respectively, and the knock-off plate is inserted into the assembly hole from the insertion opening in the extending direction of the guide rails; a rib is arranged on one of the guide rail and the knock-off plate and extends in the inserting direction parallel to the knock-off plate, a first chamfer is arranged at the end, close to an inserting opening, of the rib, the rib abuts a