The invention discloses a new method for preparing halogenated hydrocarbons, which belongs to the technical field of fine chemical synthesis. In the method, strong acidic ionic liquid is used as a halogenated agent, a catalyst and a solvent and reacts for 30 to 120 minutes at the temperature of between 60 and 100 DEG C to generate the halogenated hydrocarbons. Compared with the current methods, the method has the advantages of green preparation process, high product yield, short technological flow, mild reaction conditions, simple process, easy isolation of the product from the ionic liquid, easy recovery of the ionic liquid from a reaction system, recycling and the like, is favorable for saving energy resources, lowering investment, reducing environmental pollution and the like, and has a good application prospect.