Extrusion die for metal tube

The invention discloses an extrusion die for a metal tube. The extrusion die comprises a die core seat, wherein a runner communicating a feeding port and a discharging port of the die core seat is spirally distributed around the axis of the die core seat. According to the extrusion die for the metal tube, after a molten metal material spirally flows to the discharging port and is extruded from the discharging port, the metal material is not extruded in the single axial direction of the die core seat by the extruding pressure any more and bears circumferential extruding pressure simultaneously, so that different positions of the circumference of the metal tube bear more uniform extruding pressure in the forming process, the molten metal material is more uniformly and annularly distributed, phenomena of thickness difference of different positions of the circumference of a produced metal tube as well as irregular excircle shape of the metal tube are reduced and even avoided, and the production quality of the metal tube is remarkably improved.