The utility model discloses a beveling machine hydraulic power feed system belongs to pipeline processing technology field. This system includes: oil tank, variable pump, gear pump, switching valves,beveling machine operation unit and sideboom tractor operation unit. The variable pump is connected with tank outlet through a hydraulic line. The gear pump is connected with a hydraulic line throughthe 2nd hydraulic line. It is connected with variable pump and gear pump to switch over the valves. Beveling machine operation unit is connected with switching valves end for the control beveling machine cuts, rises tightly, impels the operation. Sideboom tractor operation unit's entry end and the exit end that switches over the valves are connected, and the exit end is through the 2nd oil outletpipeline and oil outlet pipeline intercommunication for the control sideboom tractor carries out the counter weight, becomes the width of cloth, plays to rise the operation. The utility model discloses guaranteed that the sideboom tractor can normally travel on soft road surface, avoided the travel risk of sideboom tractor on the ramp simultaneously.