The invention relates to a method for removing heavy metal ions from a ferrous chloride solution. The method adopts a two-step replacement method and particularly comprises the following steps: 1) adding a certain amount of iron powder into the ferrous chloride solution, performing reaction for a period of time under the conditions of certain temperature and mechanical stirring, and performing solid liquid separation on the reaction liquid to obtain filtrate; and 2) adding a certain amount of aluminum powder into the filtrate, performing reaction for a period of time under the conditions of certain temperature and stirring speed, and performing solid liquid separation to obtain a solution with impurities removed. The content of heavy metal ions, such as chromium, lead, nickel and copper, in the ferrous chloride solution with impurities removed reaches the national standard, and the method can be applied to production of a water treatment agent and other industrial application. The method has the advantages of novelty and practicability, simplicity and practicability, low cost, capability of effectively removing heavy metal ions, capability of realizing recycling of resources and wide industrial application prospect.