The invention discloses a preparation method for nickel-cobalt-manganese ternary hydroxide for a lithium battery. The preparation method comprises the following steps: dissolving nickel salt, cobalt salt and manganese salt in water to prepare water solution, mixing stabilizing agent with the water solution to obtain solution A, adding precipitating agent in the solution A for coprecipitation, and conducting purification and heat setting treatment to the obtained sediment to obtain the nickel-cobalt-manganese ternary hydroxide. The invention has the advantages that the preparation method for the nickel-cobalt-manganese ternary hydroxide is simple, the harmful gases causing environmental pollution are not caused in the process of preparation, the crystal lattices and the unit cells of the prepared nickel-cobalt-manganese ternary hydroxide are tidy, other atoms, ions and molecules are evenly embedded in and out, and thereby the electrochemical properties, the photochemical properties and the structural stability of the corresponding products are improved.