Belonging to the electrode material field and the electrochemical energy storage field, the invention discloses a high rate performance lithium ion battery cathode material and a preparation method thereof, in particular to a cathode material with lithium cobaltate coated by a metal organic graphene composite material and a preparation method thereof, as well as a cathode material serving as a high rate and high capacity secondary battery. The cathode material is formed by coating lithium cobaltate coated with a metal organic graphene composite material, and is prepared by ball-milling of metal nitrate, an organic carboxylic acid ligand, lithium cobaltate and grapheme, calcination and secondary ball-milling. The reversible capacity of the cathode material under 3-4.5V is above 185mAh/g (0.5C), and the reversible capacity under 15C is above 140mAh/g.