This article uses the data of 797 vegetable growers in Shouguang, Shandong Province, and the endogenous conversion model to investigate the impact of Internet use on household welfare. We select the per-mu vegetable yield, net income, and per capita net income of households as welfare indicators. The results show: ① Internet use can significantly improve the farmers' welfare effect. ②Under counterfactual assumptions, when farmers who use the Internet do not use it, the farmers' vegetable yield per mu, net income and household per capita net income will drop by 10.88%, 13.96% and 9.46%. When farmers who do not use the Internet use it, the farmers' vegetable output, net income and family per capita net income will rise by 13.62%, 16.66% and 11.64%. Internet use has the most excellent effect on the net income of vegetables, followed by the yield per mu, and the net income per household is the lowest. ③ Compared with small-scale farmers, Internet use has a better impact on the welfare of large-scale farmers, which also widens the welfare gap between farmers to a certain extent. Based on this, make suggestions to strengthen information infrastructure, improve information technology training, and adjust support policies promptly.