The invention discloses an efficient wall grinding device for building decoration, comprising a scissor lift frame and a grinding mechanism installed on the top of the scissor lift frame. There is an airtight sleeve in the airtight sleeve, a grinding cavity is arranged in the airtight sleeve, a transmission cavity is arranged in the grinding mechanism on the left side of the storage tank, a first partition is arranged between the transmission cavity and the storage tank, and the grinding mechanism on the left side of the transmission cavity is equipped with a transmission cavity. There is a driving cavity, a second partition is arranged between the driving cavity and the transmission cavity, the inner bottom wall of the transmission cavity is provided with a first sliding groove, and the first partition is slidably connected with connecting rods extending toward the left and right sides. , the extension section on the right side of the connecting rod extends into the storage groove and extends through the airtight sleeve into the grinding cavity, the right extension end of the connecting rod is fixed with a support plate, and the connecting rod is provided with a first through hole extending from left to right; the present invention The structure is simple, the design is reasonable, the sealing effect is high, the dust is prevented from flying, the occupied space can be reduced, and the manufacturing and maintenance costs are low.