The invention relates to the technical field of oil field well drilling and completing, in particular to a hydraulic anchored oblique device with a circulating by-pass valve. A releasing outer cylinder is arranged at the lower end of the oblique device, and the releasing outer cylinder and a feeding pipe are locked through a locking ball; a releasing ball base is connected to the inner wall of thefeeding pipe through a pin nail I and limits the locking ball, the lower end of the oblique device is connected with an inner pipe through an adaptor connector, a ball bearing base is arranged at theupper end of the inner pipe, and a central pipe is mounted on the outer side of the inner pipe in a sleeving mode; and a rubber cylinder base is mounted on the outer side of the upper end of the central pipe in a sleeving mode. The hydraulic anchored oblique device with the circulating by-pass valve can not only meet the requirement for circulating mud by orientation of MWD, but also can supply hydraulic pressure for anchoring of the oblique device, the tool performance is safe and reliable, on-site operation is simple, and the difficult problem that the window opening direction can be measured by adopting MWD is solved effectively; and the defect that an existing hydraulic anchoring oblique device cannot measure a window opening tool surface through the MWD is overcome.