Heating roller capable of uniformly heating surface

The invention relates to a heating roller with a uniform surface heating function, and belongs to the technical field of heating rollers, the heating roller comprises a roller and an inner shaft arranged in the roller, two opposite ends of the roller are fixedly connected with an oil inlet nozzle and an oil outlet nozzle, and the oil inlet nozzle and the oil outlet nozzle extend into the roller. The ends, extending into the roller, of the oil inlet nozzle and the oil outlet nozzle are fixed and communicated with cross pipes, a spiral oil guide plate is fixedly connected to the position, located between the two cross pipes, of the peripheral side of the inner shaft, and the side, away from the inner shaft, of the spiral oil guide plate is fixedly connected with the inner side wall of the roller. A hot oil channel through which hot oil can flow is formed between the inner shaft and the roller, four ports of the cross-shaped pipes extend to the hot oil channel, and oil passing devices are arranged at the four po