Manufacturing method of high-collapsibility mold shell

The invention relates to a manufacturing method of a high-collapsibility mold shell. The manufacturing method comprises the following steps that surface layer slurry with first specific viscosity is prepared; white corundum sand is scattered, and a surface layer is formed on the surface of a mold set; a transition layer slurry with second specific viscosity is prepared; mullite sand and graphite particles are fully mixed uniformly and manufactured into mixed sand; sequentially, the transition layer slurry coats the surface of the surface layer, and the mixed sand is scattered on the surface ofthe surface layer, so that a transition layer is formed; reinforcing layer slurry with third specific viscosity is prepared; a reinforcing layer is formed on the surface of the transition layer; slurry sealing is carried out on the mold set, and a mold shell is formed; and the mold shell is subjected to dewaxing, roasting and cooling to be manufactured into the high-collapsibility mold shell. According to the manufacturi