Precision casting method for pouring evanescent mold through high-performance coating foam and mold laminating paraffin

The invention discloses a precision casting method for pouring an evanescent mold through high-performance coating foam and mold laminating paraffin. The method includes the following steps: manufacturing an expandable polystyrene (EPS) foam mold; covering a paraffin mask on the foam mold; preparing high-performance coating; coating and drying the coating; filling sands for shaping; and burning out the foam and the paraffin mask in a casting mold and pouring metal liquid. The high-performance coating is prepared by mixing Guilin No.5 additive special for evanescent mold coating, 180-220 meshes of refractory aggregate powder and water with stirring and adding silicon solution into the mixture with stirring. Dimension accuracy and surface smoothness of a cast member poured by the method can achieve the level equivalent to that of investment precision casting small members, the shortcomings of carbon adding, slag inclusion, pores, wrinkled skin, carbon black, uneven composition, deviation of mechanical property and the like of the casting member do not exist, and large casting members, small casting members and medium casting members all can be manufactured.