Energy-saving evaporation drying device

An energy-saving evaporation drying device is provided with a rake dryer, a vacuumizer, a steam input pipeline, a steam discharge pipeline, a steam recycling machine and a steam return pipeline. The rake dryer comprises a dryer cavity, and the dryer cavity is connected with a dryer heat source inlet and a dryer steam outlet; the vacuumizer is connected with the dryer cavity; the steam input pipeline is communicated with the dryer cavity through the dryer heat source inlet; the steam recycling machine comprises a recycling machine cavity, the recycling machine cavity is connected with a recycling machine steam inlet and a recycling machine steam outlet, one end of the steam discharging pipeline is communicated with the drying machine cavity through the drying machine steam outlet, and the other end of the steam discharging pipeline is communicated with the recycling machine cavity through the recycling machine steam inlet. One end of the steam return pipeline communicates with the recycling machine cavity thro