The invention relates to a method for preparing a nickel cobalt lithium manganate/molybdenum oxide spherical electrode material by utilizing an atomic vapor deposition technology, and belongs to the technical field of lithium ion battery positive electrode materials. In order to solve the problem that a molybdenum oxide deposition layer prepared through an existing deposition method is not uniformin thickness, the invention provides a method for preparing the nickel cobalt lithium manganate/molybdenum oxide spherical electrode material by utilizing the atomic vapor deposition technology. Thepreparation method comprises the following steps: preparing nickel cobalt manganese hydroxide from nickel salt, cobalt salt and manganese salt; mixing the nickel cobalt manganese hydroxide with lithium nitrate; calcining the mixture to prepare nickel cobalt lithium manganate powder; introducing a molybdenum source and an oxygen source into a reaction chamber according to a certain program for cyclic deposition, and forming molybdenum oxide deposition layers with uniform thicknesses on the surface of the nickel cobalt lithium manganate layer by layer. The molybdenum oxide deposition layer obtained by the invention can keep the structural stability of the electrode material, effectively prevent the corrosion of an electrolyte and the structural change after multiple times of charging and discharging, improve the utilization rate of lithium ions, and obviously improve the cycle stability when the obtained electrode material is applied to the lithium ion battery.