The invention discloses a fast-drying cemented carbide molding agent and its mixing process, which is composed of the following components in weight percentage, wherein: paraffin wax, 50-60%; oleylamine, 1-5%; soybean oil , 5 to 10%; n-octane, the balance. The present invention introduces soybean oil lubricating components, through reasonable control of the ratio of plasticizing components and solvent components, endows the extrusion feed with better plasticity and viscosity, and ensures that the extruded billet has better shape maintenance properties; By introducing n-octane as a solvent, n-octane has good miscibility with the molding agent of paraffin wax system compared with the existing solvents, and there will be no segregation of the molding agent after mixing; at the same time, n-octane has moderate volatility, ensuring To ensure the stability of the mixture, it can realize fast drying in the shade or drying.