The invention provides a nano doping agent modified LiBH4 hydrogen storage material and a preparation method thereof. The hydrogen storage material is composed of a nano ferrite doping agent and a ligand hydride LiBH4, wherein the mol ratio of the doping agent is 3% to 11%. The preparation method comprises the following step of carrying out ball milling for 20 to 100 minutes at the rotary speed of 1000rpm to 1500rpm by adopting a ball milling pot with a PV lining and a zirconium oxide material milling ball. According to the nano doping agent modified LiBH4 hydrogen storage material, the decreasing range of an initial decomposition temperature can be up to 226 DEG C and the final hydrogen releasing amount is improved by more than 5 times; the dynamic performance at 300 DEG C can be remarkably improved and the preparation method is simple and feasible.