Polishing device for wall decoration

The invention discloses a wall decoration grinding device, which relates to the technical field of wall grinding and comprises an expanding grinding device, a grinding device, a first bolt, a supporting assembly and a fixing assembly. According to the expanding and grinding device, an expanding cover is turned outwards, the expanding cover drives a lifting rack to be lifted through a lifting gear, the lifting rack drives a moving assembly to be lifted through a lifting assembly, a liquid storage assembly is inserted into the moving assembly, at the moment, viscous liquid can be thrown out in the moving process of the moving assembly, and the expanding and grinding device is tightly attached to the wall surface in a viscous mode; therefore, the expansion of the polishing area and the adhesion of the wall surface are synchronously realized. According to the grinding device, the in-situ rapid steering of the grinding device is achieved through clockwise one-way rotation of the switching assembly and the grinding