The invention discloses a preparation method for a nickel lithium manganate coated composite material. The preparation method comprises the following steps of adding a composite solution of a calcium salt, a zircon salt and a titanium salt into a pure-phase nickel lithium manganate precursor suspension liquid, simultaneously adding polyethylene glycol (PEG) as a dispersing agent and citric acid as a complexing agent, adjusting pH with ammonia water, carrying out mechanical stirring and constant-temperature waterbath reaction, taking out and ageing the composite solution, and carrying out filtering, washing and drying to obtain a Cao-ZrO2-TiO2 coated nickel lithium manganate precursor, wherein the composite solution is prepared from Li, Ca, Zr and Ti according to the ratio of 2:x:x:x, and x is equal to (0.01-0.1); and carrying out calcination and annealing processing in an air atmosphere to obtain the CaO-ZrO2-TiO2 coated nickel lithium manganate composite material. The material obtained according to the preparation method is pure in phase, well crystallization is achieved, the process is simple, continuous industrial production is easily realized, moreover, the initial discharging specific capacity at 0.2C reaches over 130mAh / g, and the cycle capacity retention rate at 0.2C after rate of 100 times is over 97%.