The invention discloses a mold rapid cooling and rapid heating device. The device comprises a heater, a pumping, an auxiliary water tank and a valve set; the valve set is provided with a mold input opening, a mold return opening, a cold water inlet, a cold water outlet, a hot water inlet and a hot water outlet, wherein the mold input opening and the mold return opening are connected with a mold correspondingly; the valve set is operable to be in a first gear position or a second gear position, when the valve set is in the first gear position, the cold water inlet communicates with the mold input opening, and the cold water outlet communicates with the mold return opening; when the valve set is in the second gear position, the hot water inlet communicates with the mold input opening, and the hot water outlet communicates with the mold return opening; and the hot water outlet is connected with the auxiliary water tank, the auxiliary water tank is connected with the pumping, the pumping is connected with the heater, and the heater is connected with the hot water inlet. According to the mold rapid cooling and rapid heating device, the rapid switching of cold water and hot water in the mold can be realized, weld marks can be effectively eliminated, the injection molding process is reduced, the personnel expenditure is reduced, the cost is effectively reduced, and the delivery time is shortened.