The invention discloses a positive electrode material precursor, a preparation method thereof and a positive electrode material. Cotton-shaped Mn3O4 with better dispersion performance and difficult toagglomerate is coated on a surface of a Ni<1-x-y>CoMn(OH)<2> particle to obtain the positive electrode material precursor with more uniformly-coated coating layer, positive electrode material precursor and a lithium-containing compound are mixed and calcinated to obtain the positive electrode with more uniformly-distributed manganese and nickel on a surface and having better thermal stability and electrochemical performance for the lithium ion battery, so that a positive effect of the lithium ion battery in commercial application of more fields is achieved.