The utility model discloses an assist hydrophobic working medium of vapour and heat reclaim unit, including assist vapour drain water expander, respectively with assist hydrophobic cooling device of subsidiarys vapour and drainage equipment that vapour drain water expander is connected, reach and water supply equipment that the hydrophobic cooling device of assistance vapour is connected, assisting the hydrophobic cooling device of vapour and including that steam subtracts warm condensing equipment, steam subtracts warm condensing equipment and is located subsidiary vapour drain water expandertop, is connected with the overboard steam drain mouth of assisting vapour drain water expander, steam subtract warm condensing equipment inside be equipped with subtract the warm water shower nozzle, dabble board and drip water plate, subtract the warm water shower nozzle and be connected with water supply equipment, the board that dabbles is located above the drip water plate. The device can prevent that the outside air from getting into exhaust equipment, influences the unit and moves the vacuum, and under the extreme condition of hydrophobic operation at no water level, the check valve isclosed, prevents outside air refluence income exhaust equipment, does not increase any power consumption device, installation and convenient operation, and manufacturing and maintenance cost are low,the messenger assists the hydrophobic working medium of vapour, the heat is fully retrieved.