Run-out-free windowing sidetrack drilling tool and casing windowing sidetrack drilling construction method

The invention relates to a drilling-out-free windowing sidetrack drilling tool and a casing windowing sidetrack drilling construction method, the tool comprises a setting mechanism, a pressure building mechanism, an anchoring mechanism and a whipstock are sequentially arranged above the setting mechanism, and the upper end of an inclined body of the whipstock is connected with a drilling and reaming type composite drill bit through an inclined body shear pin. A hydraulic rubber pipe is embedded in the back face of the inclined body, the lower end of the hydraulic rubber pipe is connected with a center hole of the anchoring mechanism, and the upper end of the hydraulic rubber pipe enters a certain water hole of the drill bit from the upper end of the beveled face of the inclined body. A floating connector is arranged in a center hole of the drill bit, and the upper end of the hydraulic rubber pipe is connected with the floating connector. A casing windowing and sidetrack drilling construction method sequential