Method for controlling solidification of investment casting magnesium alloy casting and investment casting method

The invention relates to the technical field of casting processes, in particular to a method for controlling solidification of an investment casting magnesium alloy casting and an investment casting method. The method for controlling solidification of the investment casting magnesium alloy casting comprises the following steps that A, a material with the heat conductivity coefficient smaller than 0.002 W/(m.K) is added to the position, corresponding to the thin-wall part of the casting, of a transition layer of a mold shell; the thickness of the thin-wall part of the casting is less than 5mm; b, a silicon carbide cooling element is adopted in the position, corresponding to the thick wall part of the casting, of the mold shell; the thickness of the thick wall part of the casting is greater than 20mm; c, coating ceramic glaze on the outer surfaces of the riser and part of the pouring gate; the coating thickness of the ceramic glaze is 0.2 to 0.3 mm; and D, the alloy is poured into the mold shell, and after pour