The invention discloses an anti-drop dairy cow drencher. The scheme is that the anti-drop dairy cow drencher comprises a cylinder, a piston, and a medicine feeding pipe. One end of the cylinder is provided with a cylinder cover. The piston is provided with a piston rod. One end of the piston rod is connected with the piston, and the other end extends out of the cylinder cover. The medicine feeding pipe comprises a horizontal pipe and a bended pipe. A short pipe extends from the middle part of the horizontal pipe. The short pipe is connected with a noose. Two ends of the bended pipe are connected with two ends of the horizontal pipe. The bended pipe is provided with a medicine outlet. The drencher also comprises a base. The cylinder is fixed on the base. The cylinder is provided with a medicine inlet pipe and a medicine outlet pipe. The medicine inlet pipe and the medicine outlet pipe are provided with valves. The position of the base, close to the medicine outlet pipe, is provided with a reel. The medicine outlet pipe is connected with a flexible pipe. The flexible pipe is coiled on the reel and is connected with the short pipe. The invention provides the anti-drop dairy cow drencher, so that shaking of the head of a dairy cow in drenching would not influence an operator to drench.