The invention discloses a fluid-driven tunneling device, which uses fluid such as hydraulic oil, water or compressed air as energy to drive a rotating device to move. With a simple structure, large torque, high rotating speed, high transmission efficiency, low energy consumption and small vibration, the device can meet the requirements of the tunneling device on torque, rotating speed and runningstability well, at the same time, the fluid power device comprises an outer ring and a core body, wherein at least one-step or more-step secondary flushing channels are arranged between a nozzle and an exhaust port of the outer ring surface of the core body, the fluid enters from an inlet channel, is ejected step by step through the nozzle of the core body and the secondary flushing channels, actson at least two driving concave parts in the circumferential direction of the outer ring, generates thrust on the driving concave parts to push the outer ring to rotate and do work, and realizes power output; and finally, the fluid is discharged through the exhaust port of the core body from an exhaust channel.