3D metal printer nozzle

The invention belongs to the technical field of material increase manufacturing and relates to a 3D metal printer nozzle which is characterized by comprising an inner core and a coating sleeve, wherein the coating sleeve sleeves the exterior of the inner core; the inner core comprises an inner core section I, an inner core section II and a load block; the load block is embedded into the periphery of the inner core section II; the coating sleeve comprises a coating sleeve section I, a coating sleeve section II, a cooling device and a heating device; the cooling device is arranged at the interior of the coating sleeve section I; the heating device is arranged at the interior of the coating sleeve section II. The 3D metal printer nozzle can be used for solving the problems that the metal spray deposition 3D printer nozzle based on a wire feeding manner is liable to block and wires are discontinuously extruded; the efficient formation of the 3D printing based on the wire feeding manner is implemented.