The invention relates to a method for improving the electrochemical performance of perovskite-type oxide lanthanum ferrite. The method mainly comprises the following steps of impregnating the perovskite-type oxide lanthanum ferrite into a mixed solution which is prepared from aniline, protonic acid and water according to a molar ratio of (1.8 to 19.8)*10<-3>:(0.1 to 1.6)*10<-4>:1, stirring the mixed solution for 5 to 20 minutes at stirring speed of 100 to 400 revolutions per minute, performing washing and suction filtration on the treated perovskite-type oxide lanthanum ferrite, drying the treated perovskite-type oxide lanthanum ferrite in a vacuum drying oven, and carrying out high-temperature calcination on the dried perovskite-type oxide lanthanum ferrite in a tubular furnace to carbonize polyaniline attached to the surface of perovskite-type oxide lanthanum ferrite powder, so that the surface of the perovskite-type oxide lanthanum ferrite powder is coated with amorphous carbon. The method has the advantages of simple treatment process, readily availability of raw materials, low production cost and the like, and is applied to the perovskite-type oxide lanthanum ferrite and A-position doped and B-position doped lanthanum ferrite, and the hydrogen storage capacity and the high-rate discharge performance of lanthanum ferrite can be remarkably improved.