The invention provides a tool and method for feeding rotary tail pipes without reversing and relates to the field of natural gas exploration and development. The tool comprises a central pipe and a tail pipe connecting cylinder, and the tail pipe connecting cylinder is nested with the central pipe through a connecting ball device; the connecting ball device includes a jacking rod disposed on the tail pipe connecting cylinder, a connecting ball and a ball base disposed in the central pipe. In a first state, the connecting ball is mounted between the ball base and the jacking rod; by putting a ball into a wellbore to decrease the pressure, the ball base in the central tube is separated from a shear pin, and the ball base and the jacking rod move and deviate from the connecting ball, so thatthe tail pipe connecting cylinder is separated from the central tube, and the purpose of feeding the tail pipes is achieved. According to the tool and the method, the tail pipes can safely and smoothly enter casing pipes, and it is ensured that tail pipe cementing operation is conducted smoothly; after a tail pipe string drops to the bottom of a well, decrease of the pressure caused by putting theball into the wellbore does not happen, it is ensured that the rotating tail pipes can be smoothly sent without reversing, and the implementation method is reliable; at the same time, the structuraldesign is simple, machining is easy, and the production and manufacturing costs are reduced.