The invention discloses a preparation method for an organic titanium paper surface strengthening agent. The preparation method comprises the following steps: adding titanium sulfate, an organic ligand A, an organic ligand B and water according to a certain ratio into a reactor; stirring and heating to 70 to 80 DEG C in a water bath; then, allowing a reaction to continue for 4 to 5 hours at 70 to 80 DEG C till the system turns to be transparent completely; finally, compounding, adding a suitable amount of water and nickel chloride, stirring uniformly, cooling to room temperature, and discharging to obtain the organic titanium surface strengthening agent with a good strengthening function to paper. The organic titanium paper surface strengthening agent prepared by the preparation method can be compounded with macromolecules, such as aqueous solution of starch and aqueous solution of PVA (Polyvinyl Acetate), is used for applying glue to the surface of the paper, and can simultaneously improve the indexes of surface strength, fracture length, tensile strength and the like of the paper greatly.