The invention discloses a method for zinc hydrometallurgy. The method comprises the following steps: applying the mixed gas of sulphur dioxide and oxygen to a zinc concentrate fluidized-bed roasting process, so as to promote zinc concentrates to be oxidized to generate zinc oxide or zinc sulphate; meanwhile, efficiently decomposing zinc ferrite generated during the fluidized-bed roasting process; and insulating hot calcine so as to regulate and control the physical phase of iron in the calcine, and realizing selective leaching of zinc under a neutral condition or a weak acid condition. According to the method, through adjusting the technological process, the efficiency of zinc concentrate oxidization roasting is increased, the zinc ferrite is decomposed, the physical phase of iron in the zinc calcine is regulated and controlled, efficient selective leaching of zinc is realized, and the comprehensive recovery rate of zinc is increased; leaching of iron is effectively reduced, the problem of precipitate iron slag is solved, and the source emission reduction of a zinc smelting technique is realized; and the production cost of the zinc smelting technique is reduced.