The utility model provides a feeding auxiliary cantilever roller bed device for cold pipe mills, and relates to cold pipe mills. The feeding auxiliary cantilever roller bed device solves the problems that an existing auxiliary roller bed is large in processing difficulty, and high in manufacturing cost. The feeding auxiliary cantilever roller bed device comprises a pull rod, a coupling head, a pin shaft, a swing arm, a shaft, an eccentric plate, a cantilever shaft and a roller assembly, wherein the pull rod is driven by a hydraulic cylinder to push the coupling head to be connected with the pull rod, the coupling head is connected with the swing arm through the pin shaft, the swing arm drives the shaft to rotate, the shaft is installed on a supporting seat through a round nut, a copper sleeve and a separation sleeve, the shaft is connected with the eccentric plate through a key, the cantilever shaft is installed on the eccentric plate, and the roller assembly is installed on the cantilever shaft. The feeding auxiliary cantilever roller bed device is used in feeding equipment of pipe mills, and has the advantages of being small in occupied space, low in failure rate and easy to maintain.