The utility model relates to a prepare device of high viscosity mortar or concrete fast, it includes sealed container, exhaust tube, temperature control box, thick liquids pipe and thick liquids dispersion impeller, wherein, the exhaust tube sets up at sealed container's top, and it is connected to a vacuum pump, the exhaust tube is the T font, is equipped with a vacuum valve and a scavenging valve on it respectively, the temperature control box passes through thick liquids pipe connection to thick liquids dispersion impeller, be equipped with a control valve on the thick liquids pipe, the thick liquids dispersion impeller sets up the bottom at sealed container. Adopt the utility model discloses a high viscosity mortar quality of device preparation is good, the high quality, and the whileis high -efficient, swift, convenient, the cost is low.