Improved water system nieuwland catalyst and application method thereof

The invention relates to an improved water system nieuwland catalyst and an application method thereof. The catalyst comprises cuprous chloride, ammonium chloride and aqueous solution of hydrochloric acid in a nieuwland catalytic system, and also comprises organic amine, organic ion liquid and organic ether. In the specific preparation step, the addition sequence of the cuprous chloride, the ammonium chloride and the hydrochloric acid is adjusted, and the organic amine, the organic ion liquid and the organic ether are sequentially added into the mixture. The catalyst improves the performance of the conventional nieuwland catalyst, and can improve the conversion per pass of acetylene and the selectivity of vinyl acetylene simultaneously in a process of preparing the vinyl acetylene by applying the nieuwland catalyst; and the organic amine, the organic ion liquid and the organic ether are less in dosage and can be recycled, and thus the improved water system nieuwland catalyst has the advantages of low cost, simple method, high efficiency and the like.