The invention relates to a preparation method for a zinc oxide voltage-sensitive valve plate for a lightning arrestor, and belongs to the technical field of preparation of the voltage-sensitive valve plate. The preparation method comprises the following steps of firstly, performing mixing on fluorite powder and water, and then carrying out a mixed reaction with alkylphenol ethoxylates in an ice-water bath to obtain a mixed turbid liquid; then mixing the mixed turbid liquid with hydrogen peroxide to obtain polypyrrole-coated calcium fluoride granules; next, performing mixing and ball grinding on the granules, and zinc oxide and bismuth trioxide, and performing mixing and pressing with a polyvinyl alcohol solution, and carrying out calcining based on programs to obtain a calcined valve plate; and finally, performing mixing on aluminium dihydrogen phosphate and polyvinyl alcohol to obtain a paste liquid, and coating the surface of the calcined valve plate with the paste liquid, and drying. According to the zinc oxide voltage-sensitive valve plate for the lightning arrestor prepared by the preparation method, non-uniformity of the microstructure is avoided, and the resistance non-linearity and discharge current capacity of the voltage-sensitive valve plate are improved; the square wave discharge current capacity reaches 420J/cm<3> or above; the resistance nonlinear coefficient reaches 25.2 or above; and the voltage-sensitive voltage gradient reaches 560V/mm or above, so that the internal safety and reliability of the lightning arrester can be improved.