The utility model discloses a preheating type heat pump double-effect evaporation and concentration system. The utility model relates to a preheating type evaporation and concentration system. The utility model discloses a heat pump double-effect evaporation and concentration system. The problem that the system is difficult to efficiently operate due to insufficient secondary steam quantity is solved; the device comprises a first-effect evaporation tank, double-effect evaporation tank, heat pump evaporator, heat pump condenser, heat pump compressor, a feeding pump and a discharging pump, watercollecting tank and draining pump, a vacuum pump and a medium water circulating pump, first preheater, main feeding pipeline, one-effect feeding pipeline, the system comprises a double-effect feedingpipeline, a single-effect discharging pipeline, a double-effect discharging pipeline, a main discharging pipeline, a first secondary steam pipeline, a second secondary steam pipeline, a third secondary steam pipeline, a heat pump condensed water pipeline, a vacuumizing pipeline, a water collecting tank drainage pipeline, an intermediate water pipeline, a single-effect intermediate water pipeline,a preheater intermediate water pipeline and a heat pump working medium circulating pipeline. The heat pump evaporation concentrator is used in the field of heat pump evaporation concentration.