To provide a single pipe processing system for further easily handling a single pipe by reducing a burden of a human being.

This single pipe processing system for processing the single pipe having a circular cross section, has a regulating piece arranged in a substantially square single pipe input port opening on a substantially horizontal plane and regulating the passing of the single pipe in the single pipe input port, and a driving means rotating the driving piece; and is characterized in that the regulating piece has a plurality of first regulating pieces extending toward a central part of the single pipe input port from one edge side of the single pipe input port and arranged at an interval in the direction along one edge and a plurality of second regulating pieces extending toward the central part from the other edge side opposed to the one edge of the single pipe input port and arranged at an interval in the direction along the other edge, and the driving means reciprocatably rotates the first and second regulating pieces in the vertical direction, and the first and second regulating pieces are arranged so as to generate a crossing state of mutually crossing by its rotational position and an uncrossed state.