Full-rotation directional drilling device

The invention belongs to the technical field of petroleum drilling, and particularly relates to a drilling device. The well drilling device comprises an outer cylinder, wherein the upper end of the outer cylinder is connected with a drill string; the hinge shaft is movably sleeved with the outer cylinder, the outer cylinder can transmit torque to the hinge shaft, the central axis of the hinge shaft can incline relative to the central axis of the outer cylinder, and the lower end of the hinge shaft extends out of the outer cylinder; the drill bit is fixedly arranged at the lower end of the hinge shaft; and the eccentric mechanism is arranged in the outer cylinder and connected with the top end of the hinged shaft, and when the outer cylinder rotates, under the action of the eccentric mechanism, the hinged shaft can be kept at a fixed angle relative to the stratum. The outer cylinder can achieve full rotation in the working process, so that backing pressure is reduced, and the drilling efficiency is improved. 本