The invention relates to a method for recovering high-fluorine electrolytic molten salt, and concretely relates to a method for recovering heavy metal nickel from high-fluorine electrolytic molten salt. The method for recovering heavy metal nickel from high-fluorine electrolytic molten salt comprises the following steps: (1) crushing: crushing and filtering the high-fluorine electrolytic molten salt to obtain high-fluorine electrolytic molten salt powder; (2) washing, and separating: adding the high-fluorine electrolytic molten salt powder to a washing liquid, washing the powder, and centrifuging to obtain a filtrate and filter residues; and (3) calcining: calcining the residues to obtain metal nickel oxide. The high-fluorine electrolytic molten salt adopted as a raw material is broken, washed, separated and calcined in order to recycle the heavy metal nickel in the high-fluorine electrolytic molten salt in order to prepare the metal nickel oxide. The method has the advantages of simple process flow, realization of the metal nickel recovery rate of 95% or above, effective removal of ammonia nitrogen, avoiding of secondary pollution, no acids, alkalis or auxiliary materials by adopting the calcining technology, no wastewater discharge, and no fluoride ions in the recovered product.