The invention belongs to the technical field of glass curtain walls, and particularly discloses a cleaning device capable of conveniently cleaning a glass curtain wall. The device comprises a curtainwall body, a building body top surface, a rolling brushing mechanism, a sliding rail, an inflation mechanism and a winch used for driving the rolling brushing mechanism to be lifted and lowered, the sliding rail is arranged on the building body top surface, and a base of the winch is slidably arranged on the sliding rail; a fixed plate is arranged on the base, one end of a rolling shaft of the winch is connected with a driving device, and the other end of the rolling shaft of the winch is connected with a bearing of the fixed plate; a hanging rope is connected with the rolling brushing mechanism, a one-way bearing is arrange on the rolling shaft, and the outer ring of the one-way bearing is connected with the inflation mechanism; a first air cylinder is arranged on the building body top surface and located right below the winch, a first piston used for driving the winch to move is arranged in the first air cylinder, an air outlet pipe is communicated with the first air cylinder and theinflation mechanism, and a pressure valve is arranged on the air outlet pipe. Compared with the prior art, the cleaning device is high in cleaning efficiency and can be conveniently cleaned.