The invention belongs to the technical field of building decoration, and particularly relates to a building decoration wall wire groove forming device. The building decoration wall wire groove formingdevice aims at solving the problems that the manual labor intensity is high, a wire groove is not flat, potential safety hazards exists in wire groove forming at the high position, and broken slag hurts people. According to the following scheme, the building decoration wall wire groove forming device comprises a motor frame and a supporting base, the inner wall of the top of the motor frame and the inner wall of the bottom of the motor frame are correspondingly provided with first buffering seats which are distributed at equal intervals, and a motor is arranged on the outer walls of the bottoms of the first buffering seats; a rotating rod is arranged on an output shaft of the motor, and a driving bevel gear is arranged on the outer wall of the rotating rod; and first circular grooves areformed in the outer wall of one side of the motor frame, and the number of the first circular grooves is two. According to the building decoration wall wire groove forming device, the situations thatthe reverse extrusion force is generated when a drilling disc acts on the wire groove, then shaking of the device is caused, and then the vibration deviation is caused are avoided; the friction forcebetween the drilling disc and the wire groove is increased, so that the grooving speed is accelerated; working of the drilling disc is protected, so that the situations that the broken slag is poppedout by the centrifugal force, and then the broken slag hurts people are avoided; and the forming level of the wire groove is kept.