The invention discloses a light casing pipe for a well point. The light casing pipe comprises a high-pressure water gun. Four propelling plates are evenly distributed on the pipe wall of the lower end of the high-pressure water gun and arranged in vertical grooves of inner lantern rings on the inner wall of the casing pipe respectively. The lower ends of the propelling plates make contact with the groove bottom faces of the vertical grooves of the inner lantern rings. Eight outer lantern rings are evenly distributed on the outer circumferential face of the casing pipe along the circumference and provided with outward bends. Vertical grooves are formed by the bends and the casing pipe, steel rings are arranged in the evenly-distributed outer lantern ring grooves, the multiple outer lantern rings are evenly distributed in the axial direction of the casing pipe, the inner lantern rings and the outer lantern rings are fixed to the casing pipe through bolts, and the casing pipe is formed by rubber plates. The light casing pipe has the remarkable advantages that no dried-up well exists, and construction is convenient.