The invention relates to a knob pulling tool and a using method thereof. The knob pulling tool comprises a handle, a supporting rod and a restricted opening device. The tail end of the supporting rod is connected with the handle, the front end of the supporting rod is sleeved with the tail end of the restricted opening device, a restricted opening is formed at the front end of the restricted opening device, a draw rope capable of changing the size of the restricted opening is arranged at the position of the restricted opening, a knob can completely enter the restricted opening device through the restricted opening, the restricted opening device can completely wrap the knob by pulling the draw rope, and by pulling the handle, and the restricted opening device can be driven to take out the knob and generate same direction movement at the convenience. The restricted opening device is made of a soft rubber material, the diameter of an inner cavity of the restricted opening device in a natural state is not larger than that of the maximum periphery of the knob, and the size of the inner cavity of the restricted opening device can be larger than that of the periphery of the knob through external force. By using the knob pulling tool, knobs of different machines can be pulled out easily, the damage to a face shell and the knobs is avoided completely, part waste is avoided while the working efficiency is improved, and the cost is reduced.