The invention relates to a modified lithium manganate positive pole material for a lithium ion battery and a preparation method and in particular relates to a titanium doped modified lithium manganate powder material for the lithium ion battery and a preparation method of the material. According to the technical scheme of the invention, the modified lithium manganate positive pole material for the lithium ion battery is characterized in that the molar ratio of Li to Ti to Mn is (1.035-1.101):(0.019-0.065):(1.839-1.969). According to the doped modified lithium manganate powder material provided by the invention, the cycle function of the lithium manganate positive pole material can be improved, and the original discharge capacity can be maintained or improved.