Hot extrusion die

The utility model discloses a hot extrusion die which comprises an upper die with an upper inner die cavity and a lower die which is matched with the upper die and is provided with a lower inner die cavity, and further comprises an upper die graphite insert and a lower die graphite insert which are both provided with hollow cavities, and the upper die graphite insert is embedded in the upper inner die cavity; the lower die graphite insert is embedded in the lower inner die cavity; the upper inner mold cavity is communicated with the lower inner mold cavity, and the upper mold graphite insert is communicated with the lower mold graphite insert. By arranging the upper mold graphite insert and the lower mold graphite insert which are resistant to high temperature and high pressure and excellent in thermal conductivity, the mold and thermoelectric raw materials cannot be subjected to co-melting reaction alloying, and the situation that a sample cannot be demolded is avoided; the upper mold graphite insert and the