The invention relates to a method for preparing bromobenzene by recovering by-product multiple-substituted bromobenzene in bromobenzene synthesis, thereby realizing comprehensive utilization of the by-product multiple-substituted bromobenzene in the bromobenzene synthesis process. The method comprises the step of putting multiple-substituted bromobenzene, benzene and a certain proportion of a catalyst together for halogenation transfer reaction; the conversion rate of the multiple-substituted bromobenzene is greater than 90%.