The invention provides an automatic pond snail tail cutting machine, and relates to the field of tail cutting machines. The automatic pond snail tail cutting machine comprises a machine body, whereina feed hopper is fixedly connected to the top of the machine body, a dirt holding box is fixedly connected to the left side of the machine body, a material receiving box is fixedly connected to the right side of the machine body, a discharging pipe is fixedly connected to the top of the inner wall of the machine body, and is fitted with the bottom of the feed hopper, and a first placing plate is fixedly connected o the left side of the discharging pipe; a vibration motor is fixedly mounted on the upper surface of the first placing plate, and a rectangular block is arranged below the first placing plate; a first motor is fixedly mounted in the rectangular block, and a threaded rod is fixedly connected to an output shaft of the first motor; and a second bearing is movably connected to one end away from the first motor, of the threaded rod. The automatic pond snail tail cutting machine is free from artificial tail cutting for pond snails, so that the efficacy is greatly improved, and theconsumed time is reduced.