Lubricating steel pipe bending die

The utility model discloses a lubricating steel pipe bending die, and relates to a pipe bending device. Comprising a feeding clamping die, an auxiliary pushing die, a clamping die and a rotating wheel die, the feeding clamping die is installed on a feeding gun barrel of the pipe bending machine, the auxiliary pushing die is installed on an auxiliary pushing arm of the pipe bending machine, the clamping die is installed on a pipe bending arm of the pipe bending machine, and the rotating wheel die is installed on a rotating main shaft of the pipe bending machine. A first semicircular positioning groove is formed in the circumferential face of a rotating wheel of the rotating wheel die, a second semicircular positioning groove is formed in the end, close to the rotating wheel die, of the clamping die, and the first semicircular positioning groove and the second semicircular positioning groove form a steel pipe positioning groove matched with a 4-mm lubricating steel pipe. A third semicircular positioning groove