Oil pressing workshop condensate water heat energy recycling system and recycling method thereof

A high-pressure flash tank is connected with a secondary-evaporation preheater through a steam path, a water path of the high-pressure flash tank is connected with a low-pressure flash tank through a pipeline, and residual steam energy of the low-pressure flash tank is connected with a steam pocket of a softening tower through a vacuum pump; the low-pressure flash tank is connected with the water layer heat exchanger of the softening tower through a drainage pump. Condensate water in an oil pressing workshop is emitted by a high-pressure flash tank and then is provided for a secondary-evaporation preheater for use, steam emitted by the secondary-evaporation preheater is provided for a steam system, a steam source is taken away by power steam after secondary emission and then is provided for a softening tower for use, and the emitted condensate water is conveyed to a water-layer heat exchanger of the softening tower for heat exchange. The water heated by the water layer finally exchanges heat energy of cooling