The invention discloses an improved dust removing device, which comprises a power transmission frame body. Support columns are fixedly installed on the periphery of the bottom of the power transmission frame body, and rolling wheels are rotatably installed on the bottoms of the support columns. A tucking-in cavity with an opening facing the left is arranged on the power transmission frame body, apower transmission cavity is arranged on the right end wall of the tucking-in cavity, a first sliding cavity expanding backwards is arranged in the rear end wall of the right side of the tucking-in cavity, and a locking cavity is arranged in the front end wall of the right side of the tucking-in cavity. A first sliding block capable of sliding back and forth is arranged in the first sliding cavity, a first tooth bar is arranged at the right end of the first sliding block, a second sliding cavity is arranged in the right end portion of the power transmission frame body, and a second sliding block capable of sliding back and forth is arranged in the second sliding cavity. The improved dust removing device is simple in overall structure, the whole device is safe and reliable in operation, thepower-on and power-off operation of the power transmission cavity is simple and convenient, the use cost is reduced, electric shock accidents in the current life are effectively reduced, the safe useof the dust removing device is guaranteed, and the power supply stability is high.