The invention provides a coupling dual-function gold-based catalyst. The coupling dual-function gold-based catalyst comprises a modified metal oxide matrix, a microporous molecular sieve, and gold loaded on the surface of the matrix. The gold in the coupling dual-function gold-based catalyst is elemental gold, the high valence gold ion is not reduced in the process of catalyzing hydrochlorinationof acetylene, and the phenomenon that the catalytic stability of the catalyst is affected as the active group aggregates and is inactivated is avoided. The coupling dual-function gold-based catalyst provided by the application of the invention stably catalyzes the hydrochlorination of acetylene to produce chloroethylene, the result of the embodiment shows that the conversion rate of acetylene is higher than 92%, the selectivity of the polyethylene is more than 99.8%, the use stability of the coupling dual-function gold-based catalyst is very high, and the catalytic performance is kept unchanged within 600 hours. The invention further provides a preparation method of the coupling dual-function gold-based catalyst, and the preparation method is simple and convenient to operate and is easy toimplement.