The invention provides a copper-zinc catalyst preparation method which comprises the following steps: (1) dissolving soluble salt of Cu and Zn into water to be prepared into a solution A and preparinga sodium metaaluminate solution B; (2) adding the solution A and the solution B into a reaction tank in a parallel flow mode to be gelatinized and aged; (3) filtering serous liquid obtained in the step (2), performing hydrothermal treatment on an obtained material by water vapor and adding urea during hydrothermal treatment; (4) washing, filtering, drying, roasting and tabletting and shaping a material obtained in the step (3) to obtain the catalyst. According to the copper-zinc catalyst disclosed by the invention, a density of active component copper oxide in epiphase is large, a utilizationrate of active metal copper is high, active component copper and cocatalyst zinc are more evenly distributed, and a matched effect between the active metal copper and the cocatalyst zinc is enhanced;meanwhile, the catalyst has a reasonable hole structure, activity, selectivity and thermal stability of a synthesized methyl alcohol catalyst are improved, and service life of the catalyst is prolonged.