This application requires protection allyl acetonitrile hydrocyanation system adiponitrile technology extractant recovery system, the utility model discloses utilize triple effect vaporization system to realize extractant recycle, in addition, through the optimization to triple effect evaporating heat exchange network, can realize effective utilization of energy, can realize the clean separation of extractant and heavy ends catalyst and auxiliary agent through the triple effect evaporation, do not contain any extractant at the bottom of the triple effect evaporation tata in heavy ends catalyst that comes out and the auxiliary agent, can get back to the preorder reactor completely and carry out recycle. The beneficial effects of the utility model reside in that, the comprehensive energy consumption of reduction in extractant recovery process to reduce the manufacturing cost of allyl acetonitrile hydrocyanation system adiponitrile technology, can separate recycle with extractant and catalyst and auxiliary agent completely and implement triple effect evaporation technology to the extractant of specific constitution.