The invention discloses a high-dimensional shape hard alloy forming agent and a material mixing process thereof. The high-dimensional shape hard alloy forming agent is prepared from the following components in percentage by weight: 15 to 25 percent of paraffin, 15 to 25 percent of high melting-point paraffin, 1 to 4 percent of oleylamine, 1 to 3 percent of gasoline, 3 to 10 percent of soybean oil, 15 to 25 percent of oleamide and the balance of n-alkanes. According to the high-dimensional shape hard alloy forming agent and the material mixing process thereof disclosed by the invention, by selecting proper components and proportion, an extrusion material is enabled to simultaneously have suitable plastic deformation capacity and higher dimensional shape, and the control precision about screw pitches of the front end and the rear end of a product is high; the extrusion material is enabled to have high toughness and can bear the torsion in the extrusion process, thereby eliminating extrusion cracks; the forming agent is stable in desorption, and cracks generated in the drying in the shade and presintering process are avoided.