The invention relates to a doped lithium iron phosphate of a positive electrode material of a lithium ion power battery and a preparation method for the doped lithium iron phosphate. According to the technical scheme, the chemical formula of the doped lithium iron phosphate of the positive electrode material of the lithium ion power battery is LiFe1-xTixPO4/C, wherein x is smaller than or equal to 0.05. The doped lithium iron phosphate has the benefit that the doped lithium iron phosphate of the positive electrode material, which is excellent in conductivity, is provided, and the preparation method of the doped lithium iron phosphate is also provided.