The invention relates to a method for recycling metal nickel from fluorine-containing electrolysis fused salt, and belongs to the technical field of chemical industrial solid waste recycling treatment. The method includes the steps: crushing the fluorine-containing electrolysis fused salt to 10-100 meshes, sufficiently washing the crushed fluorine-containing electrolysis fused salt, and centrifugally separating the washed fluorine-containing electrolysis fused salt; roasting filter cakes to obtain metal nickel oxide; digesting, depositing, removing impurities, filtering mixture, and adding alkali to obtain nickel hydroxide or nickel salt. According to the recycling method, high-fluorine-containing electrolysis fused salt serves as raw materials, heavy-metal nickel in the high-fluorine-containing electrolysis fused salt is recycled by the aid of a crushing-washing and separating-roasting-digesting-depositing method, so that the nickel hydroxide or the nickel salt are obtained, the method has the advantages of low digested liquid consumption and production cost and is simple in technological process and easy to operate, impurities such as fluorine ions and ammonia nitrogen can be effectively removed, the purity of the obtained nickel hydroxide or nickel salt reaches 95% or more, and the fluorine ions are omitted.