Provided is a positionable hidden hydraulic hinge for door installation. The hydraulic hinge comprises a fixed part for connecting with a door frame, a rotation part (19) for connecting with a door leaf, and a hinge (4) for connecting the fixed part and the rotation part (19); and same further comprises a linkage assembly (8), wherein a positioning mechanism and a hydraulic pressing mechanism are arranged inside the rotation part (19), the linkage assembly (8) penetrates the hinge (4), and the two ends thereof are respectively hinged to inner mechanisms of the fixed part and the rotation part (19). By means of the present structure, a built-in hidden hydraulic hinge that is positionable, automatically closes a door, and provides hydraulic buffering can be realized, thereby improving the overall effect of door installation and having a simple and safe structure.