A medical electrocautery instrument assistant device is disclosed including a pump tube, a hollow sleeve tube on an end of the pump tube, and a tube interface on another end of the pump tube and opposite to the hollow sleeve tube. At least a clip is provided between the hollow sleeve tube and the tube interface, each clip forming a position adjusting portion and a clipping portion. Different types of electrocautery instruments remain optimal pump positions relative to the pump tube, drawing out waste blood water and the electrocautery smoke almost entirely, and avoiding hiding operation cuts from view during operations.