Chuck dropper special for skin prick test

A chuck dropper special for a skin prick test comprises suction pipe and a suction bag which are communicated. The suction bag is made of elastic material. The suction bag can deform when being stressed and can recover when not being stressed. A left clamp plate and a right clamp plate are fixed outside the suction bag. The left clamp plate and the right clamp plate are hinged to one point and can rotate around the same shaft. When the left clamp plate and the right clamp plate move towards each other, the suction bag is squeezed to discharge liquid or gas in the suction bag, and the suction bag recovers when the left clamp plate and the right clamp plate stretch.