The invention provides a multi-ion doped battery grade iron phosphate material and a preparation method thereof, the iron phosphate material is prepared by a one-step synthesis method, drying and dehydration, the mass ratio of doped V ions is 0.2%-0.5%, and the mass ratio of doped Ti ions is 0.2%-0.5%. According to the present invention, the iron phosphate preparation process is simple, the operability is strong, the doped particles of the prepared multi-ion doped battery grade iron phosphate material are reduced, the specific surface area is increased, the chemical activity is improved, the grinding efficiency during the lithium iron phosphate preparation process is improved, and the co-doping of V and Ti does not change the crystal form structure of the iron phosphate, optimizes the crystal structure, and further improves the lithium iron phosphate preparation efficiency. The diffusion impedance of lithium ions is reduced, the exchange current density is increased, and the conductivity of a material body is improved. And multiple ions are doped into iron phosphate crystal lattices, so that the interplanar spacing is increased, Li < + > de-intercalation is facilitated, the transfer rate of lithium ions among particles is increased, the impedance among the particles is reduced, the exchange current density is increased, and the electrochemical performance of lithium iron phosphate is improved.