The invention discloses a method for extracting zinc from a refractory zinc core in hydrometallurgy by a dispergator. The method comprises the following steps of: a, adding the dispergator in an amount of 0.5 to 2.0 percent based on the total weight of the refractory zinc core into the refractory zinc core, adding water in an amount which is 2 to 3 times the weight of the refractory core into themixture, and stirring the mixed product uniformly; b, adding an inorganic acid into the mixed product to perform an reaction for 2 to 3 hours at the temperature of between 70 and 90 DEG C and a pH value of between 2.0 and 3.0; standing the reaction solution for 0.5 to 1 hour; c, separating out supernate to obtain zinc-contained leaching solution; and d, extracting zinc compounds from the zinc-contained leaching solution. By using the particular characteristics of the dispergator, the zinc compounds can be extracted from the zinc core, so the reaction speed is improved, the reaction time is reduced and the extraction ratio of the zinc is improved to over 85 percent from a ratio of between 50 and 60 percent of the conventional process.