The invention discloses a preparation method of titanium-doped lithium iron phosphate positive electrode material. Lithium source compound, phosphorus source compound, iron source compound and metal titanium are used as raw materials, mixed uniformly, melted at high temperature in a furnace, and quenched in water. into granules, and then together with carbon source compounds, through grinding and dispersion, so that the particle size reaches the fineness index of D90≤0.2μm, and then spray-dried to make powder, and calcined in an atmosphere furnace at 600-800°C for 40-300 minutes, After cooling, the lithium iron phosphate positive electrode material is obtained; the uniformity of the lithium iron phosphate positive electrode material is improved by adopting a high-temperature melting method; metal titanium powder is introduced, and the Fe in the melt is melted at a high temperature. 3+ reduced to Fe 2+ , and make the generated Ti 4+ Doped into the lithium iron phosphate structure, the electronic conductivity of the lithium iron phosphate positive electrode material is improved by forming vacancies; the specific surface area is reduced by grinding, dispersing and carbon coating, and the tap density of the lithium iron phosphate positive electrode material is improved. Breaking and integrating not only maintains the original sphericity but also simplifies the process.