A recyclable integrated self-sealing well window sidetracking tool comprises a hollow milling cone, a guide bevel iron, a sealing anchor device and a well sealing device, wherein the sealing anchor device comprises a cylinder sleeve, a conical body, a stop tube and a slip arranged in the cylinder sleeve; the well sealing device comprises a connector, a
piston outer tube, a stop tube, a sealing sleeve and a sealing head connected in sequence, a center rod and a
piston are arranged in the
piston outer tube, the upper end of the center rod is fixedly connected to the connector, the stop tube and the piston outer tube are connected by threads, so that the
drilling fluid can push the piston to force the stop tube to move downward after entering the first annular cavity between the connector and the piston in the piston outer tube; the first annular cavity is connected to the inner cavity of the stop tube, the sealing sleeve is arranged on the center rod and is limited by the sealing head connected to the lower end of the center rod; the cone body is one and has a small outer
diameter at the top and a large outer
diameter at the bottom, and the lower end of the stop tube is fixedly connected to the connector. The tool has a well sealing function, a short operation cycle, can be fully recovered after the sidetracking is completed, and has a wide range of applications.