The invention discloses an automatic sprinkler for quenching of through shafts and belongs to the technical field of heat treatment of the through shafts with an aim to achieve the technical purposesof increasing fluidity of water, improving quenching effect and ensuring quality stability of the through shafts. The technical scheme includes that two uprights are respectively and fixedly arrangedon two sides of a water storage tank, each upright is provided with an inner cavity fixedly equipped with a lift hydraulic cylinder, the cylinder body of the lift hydraulic cylinder is fixed on the bottom of the upright with a piston rod being straight up, the piston rods of the two lift hydraulic cylinders are fixedly connected with two sides of a sprinkling tank respectively and drive the same to move vertically, the sprinkling tank is located right above the water storage tank, the sprinkling tank is a hollow box provided with corresponding through holes in the upper and lower sides, the upper portion of the sprinkling tank is communicated with the bottom of the water storage tank through multiple water return pipes, a placement platform is fixedly mounted in the water storage tank, andthe multiple shafts are placed on the placement platform through a fixing frame and penetrate the corresponding through holes vertically.