Negative pressure plant leaching solution concentration system

The invention discloses a negative pressure plant leaching solution concentration system. According to the system, a vacuum air pump is connected to a steam outlet pipe of a concentration tank and is connected with an air inlet pipe of each condenser; the condensers are connected in series; the lower end of each condenser is connected with a temporary solvent storage tank; the temporary solvent storage tank is connected to a solvent storage tank; a liquid heater is arranged on a liquid outlet pipe of the solvent storage tank; and an outlet pipe of the heater is connected to the lower end of a fractionating tower. When the vacuum air pump on the steam outlet pipe of the concentration tank operates, the pressure in the concentration tank is reduced, so that a leaching solution is boiled to evaporate at a low temperature, the heating time is shortened, and the concentration efficiency is greatly improved. Moreover, because the temperature of evaporated vapor in a negative pressure state is lower than that under normal pressure, the cooling temperature difference on the condensers is relatively reduced in the process of condensing and recycling the evaporated vapor, and thus the energy consumed by the condensers is greatly reduced.