The invention provides a method for preparing a cobalt fluoride fluorating agent. The preparation method comprises the steps as follows: a carrier material is combined by adopting cobaltous fluoride, and the generated cobalt fluoride plays the role of the fluorating agent on a solid-phase carrier by drying, roasting and activating. The invention provides a fluorating agent prepared by using the method disclosed by the invention. The fluorating agent is long in service life and not easy to atomize. The fluorating agent disclosed by the invention is applicable to being combined with a fixed bed device to prepare perfluoropropane by adopting a hexafluoropropylene as a raw material. The process is simple in reaction equipment, and easy to operate.