A rotary guiding device based on radial driving force, wherein comprising: a rotating shaft, the rotating shaft is able to drive a tool head to rotate, the rotating shaft includes an upper shaft portion, a lower shaft portion, and a steerable portion, the upper shaft portion and the lower shaft portion are steerably connected by the steerable portion; a non-rotating body mounted on the upper shaft portion, the non-rotating body is substantially non-rotating with respect to the rotating shaft in the circumferential direction when the rotating shaft rotationally drives the tool head, the lower shaft portion includes a rib portion that coincides at least partially in the axial direction with the non-rotating body, characterized in that the non-rotating body includes at least three hydraulic driving mechanisms uniformly distributed along its circumferential direction, the three hydraulic driving mechanisms are adapted to controllably generate radial drive forces respectively, the radial driving forces acts on the rib portion that is overlapped with the non-rotating body so as to make the lower shaft portion rotate relative to the steerable portion; the upper shaft portion is provided with a primary circuit cavity, at a position close to the non-rotating body, and the non-rotating body is provided with a secondary circuit cavity at a position close to an end of the upper shaft portion, the secondary circuit cavity is connected to the hydraulic driving mechanism, power transmission and signal communication can be realized between the primary circuit cavity and the secondary circuit cavity, a transmission device is mounted between the upper shaft portion and the non-rotating body, the transmission device is a primary side and a secondary side of non-contact power and signal transmission, by which power and data communication between the primary circuit cavity and the secondary circuit cavity is achieved by using electromagnetic induction principles. a rotating shaft, the rotating shaft is able to drive a tool head to rotate, the rotating shaft includes an upper shaft portion, a lower shaft portion, and a steerable portion, the upper shaft portion and the lower shaft portion are steerably connected by the steerable portion; a non-rotating body mounted on the upper shaft portion, the non-rotating body is substantially non-rotating with respect to the rotating shaft in the circumferential direction when the rotating shaft rotationally drives the tool head, the lower shaft portion includes a rib portion that coincides at least partially in the axial direction with the non-rotating body, characterized in that the non-rotating body includes at least three hydraulic driving mechanisms uniformly distributed along its circumferential direction, the three hydraulic driving mechanisms are adapted to controllably generate radial drive forces respectively, the radial driving forces acts on the rib portion that is overlapped with the non-rotating body so as to make the lower shaft portion rotate relative to the steerable portion; the upper shaft portion is provided with a primary circuit cavity, at a position close to the non-rotating body, and the non-rotating body is provided with a secondary circuit cavity at a position close to an end of the upper shaft portion, the secondary circuit cavity is connected to the hydraulic driving mechanism, power transmission and signal communication can be realized between the primary circuit cavity and the secondary circuit cavity, a transmission device is mounted between the upper shaft portion and the non-rotating body, the transmission device is a primary side and a secondary side of non-contact power and signal transmission, by which power and data communication between the primary circuit cavity and the secondary circuit cavity is achieved by using electromagnetic induction principles.