The invention belongs to the field of oil and gas development, and relates to a special tool for casing pipe repairing and strengthening agent construction and a using method thereof. The casing piperepairing and strengthening agent construction device comprises three parts of an upper part, a middle part and a lower part, wherein the upper part, the middle part and the lower part are connected in sequence. The middle part is a cylinder body, a piston is arranged in the cylinder body, and an outlet hole is formed in the side surface, close to the lower part, of the cylinder body. Packers arearranged on the outer surfaces of the upper part and the lower part, the piston and the packers are provided with driving devices separately, and the driving devices are matched with piston and the packers. According to the casing pipe repairing and strengthening agent construction device, a suspended cement plug or a lower retrievable bridge plug is not required for blocking the bottom of a damaged part, no drilling plug process exists, the process is simple, the construction time is short, and the construction cost is low.