The invention provides an integral window drilling tool. The integral window drilling tool comprises a window sidetrack drilling unit, a tile clamping anchoring unit and a friction direction changing unit connected in order from top to bottom. The integral window drilling tool adopts a mechanical seat sealing principle by rotating and pushing, and is simple in structure, simple in operation, reliable in performance, high in efficiency, and capable of completing the constructions of drilling tool downward entering, direction settling, seat sealing, window opening, window fixing and the like in one time drilling; axial direction compression resistance and circumferential torsion resistance are realized through a set of clamping tile, and the direction changing groove design of the mechanical anchoring mechanism can effectively prevent a mistake of seat sealing caused by lifting a drill stem excessively during the process of drilling down and up and increase the stability of tile clamping anchoring.