Preparation method of printing ink electric conductor

The invention belongs to the technical field of ink electric conductor preparation, and particularly relates to a preparation method of an ink electric conductor, which comprises the following steps: preparing an isocyanate-terminated polyurethane prepolymer, adding epoxy resin into the isocyanate-terminated polyurethane prepolymer, then adding ethylene glycol monoethyl ether acetate to dissolve a mixed solution, and reacting for 2-3 hours to obtain polyurethane modified epoxy resin; the method has the beneficial effects that the service life of the ink electric conductor is prolonged by adopting the dried ink electric conductor, the preparation process is simple and reliable, various cold light patterns can be made according to needs, and the ink electric conductor is bright in color, clear in body, good in contrast ratio, energy-saving, environment-friendly, excellent in outdoor interference resistance and suitable for various environments.