The wallboard supporting piece comprises a first fixing part, a second fixing part and a third fixing part, the first fixing part, the second fixing part and the third fixing part are sequentially arranged in the axial direction, and the relative position between the first fixing part and the second fixing part can be adjusted within a certain range. An
assembly hole is formed in the side, close to the third fixing part, of the second fixing part, and a fixing column is arranged on the side, close to the second fixing part, of the third fixing part and comprises a first fixing section, a second fixing section and a third fixing section. The side face of the first fixing section has a certain taper, so that at least part of the
diameter of the first fixing section is larger than that of the
assembly hole, and the end
diameter of the fixing section is smaller than that of the
assembly hole. And during disassembly, the position of the third fixing part is found, and the wallboard at the position of the third fixing part is knocked by using a hammer, so that the third fixing section is inserted into the assembly hole and the assembly hole is damaged or expanded, and the wallboard can be removed in sequence.