The invention relates to a microcast technology of rare earth ceramic shell titanium alloy wax mold which comprises the following craft processes: preparing rare earth fire resistive material, coating shell surface course, back padding shell and so on. The procedure of rare earth fire resistive material is mixing rare earth oxide and stabilizer, burning it in high temperature furnace and controlling the temperature at 1850 deg. The procedure of coating shell surface course is mixing rare earth oxide and zirconium acetate solution with the charge ratio: 3.4:1. Immerging the wax mold into surface course paint with the working temperature at 25 deg. and relative humidity at 70%, the temperature of surface course paint at 20 deg. and the viscosity of surface course paint at 22sec. The procedure of back padding shell is putting the shell into case and filling silicate-bonded sand and discharging the gas hole between the case and shell, then drying it.