The invention relates to a method for enhancing the recovery rate of zinc fusion casting. The method comprises the following steps: a mixture of ammonium chloride and colophony is added as a slagging agent in the melting process of zinc, the specific weight of the colophony in the weight of the mixture is 1-80%; zinc metal and zinc oxide in scum are separated and recovered by the methods of sorting, sieving and reselecting; a zinc ball is adopted as a mineral milling medium in the milling process of the recovered scum for dry milling, the scum is sorted into a big zinc block by manual sorting, the zinc scum is milled by a ball mill, and thicker zinc powder and zinc granules are sieved and graded at an outlet of the ball mill; the thinner zinc powder and zinc oxide are blown away by wind, dust collection and grading are carried out by a cyclone collector and a bag collector, and products with different grades are obtained. The invention can obviously lower the yield of the scum in zincfusion casting; compared with an NH4Cl slagging agent which is independently added, the yield of the scum can be lowered by 3-5%, and the recovery rate of the zinc fusion casting is enhanced. In addition, the invention is beneficial to lowering the content of zinc-oxygen powder chlorine ions recovered in slag, conforms to the requirement of a work section for extracting indium and reduces the expenditure of dechlorination.