The utility model provides an efficient membrane distillation plant. Including running through in the way setting of raw materials liquid stream: preheating device for preheat former feed liquid, an equalizing basin, multiple -effect membrane distillation system, with a steam flow path of the steam outlet intercommunication of multiple -effect membrane distillation system, the steam flow path with preheating device connects. Adopt multiple -effect vacuum membrane distillation, be equipped with percolating water and collect recovery system, can effectively avoid percolating water to pollute and produce water, ensure to produce water quality of water. The with a system of multiple effective membrane distillation simultaneously three -section heat recovery system can improve system's heat utilization efficiency, reduces system energy consumption, improves vacuum membrane distillation's practicality.