The still barrel can be used both for recovering wax material at medium temperature and for melting wax material at low temperature. It is an ideal equipment necessary for precision casting. The machine is composed of three layers, the inner layer is in full contact with the wax material, made of stainless steel, does not pollute the wax material; The middle layer is the heating layer, which is equipped with thermal oil, and the temperature control is accurate by indirect heating. The outer layer is insulated to prevent burns.