Evanescent mould casting process capable of preventing deformation

The invention discloses an evanescent mould casting process capable of preventing deformation. The evanescent mould casting process comprises the following steps: partitioning a foam material to obtain various mould pieces, and arranging bump structures at the joints of various mould pieces having the joints in the event of sticking; sticking various mould pieces together, wherein the parts having the joints are jointed by using hot melt adhesive; omissive jointing is avoided; sand is prevented from entering; coating a paint on a casting model formed by sticking various mould pieces together, and drying; putting the dried casting model into a sand box, filling dry sand, and compacting by vibration; covering the upper part of the sand box by using a plastic film, and vacuumizing the sand box; and casting molten metal into the area of the sand box corresponding to the casting model, wherein the casting model disappears by gasification; carrying out metal replacement of the casting model, and cooling to obtain a casting. According to the invention, the phenomenon of deformation of the casting during pouring due to the fact that the plurality of mould pieces are stuck to generate gaps in the event of casting an evanescent mould can be effectively solved; deformation can be effectively prevented; and the product qualified rate can be increased.