Handheld drencher

The handheld drencher comprises a push button, the bottom end of a push rod is fixedly connected with a piston head, the outer side of the piston head is slidably connected with a medicine storage cylinder, the inner side of the bottom end of the medicine storage cylinder communicates with a drenching head, the top end of the medicine storage cylinder is fixedly connected with an end cover, and one end of the medicine storage cylinder is fixedly connected with a limiting frame. A connecting plate is slidably connected to the inner side of the limiting frame, a connecting frame is fixedly connected to the top end of the connecting plate, and it can be guaranteed that the downward moving distance of the piston head each time is unchanged by adjusting the distance between the movable shell and the limiting frame, so that it is guaranteed that the phenomenon that the drenching amount is too large or too small is avoided; a veterinarian can directly push the piston head through the push button and the push rod, th