Since the curing degree of UV ink is a key influencing factor of printing quality, the work aims to develop a novel ink curing evaluation method to accurately and intuitively judge the curing degree of the UV ink layer and guide the optimization of printing process conditions. A series of offset printing products with different curing degrees were prepared by adjusting the UV curing light energy acting on the ink layer. The degree of curing crosslinking reaction was quantitatively analyzed through the intermittent infrared method to measure the double bond conversion rate of the ink layer. Further, the evaluation method for curing degree of the ink layer was established based on the friction times of the ink layer in different solvents. The samples under different UV curing energies had different double bond conversion rates, and the wear resistance times of the printed products under different proportions of ethanol and water mixed solvent could determine the curing degree of the printed products. In conclusion, the solvent loaded friction method has low dependence on subjective experience and can determine the overall ink curing degree of UV ink printed products, which has good application value in production.