Urban distribution network planning is the key technology of smart distribution network. The survey method is used to summarize the economic evaluation, load forecasting, and power grid planning of urban power grids. On this basis, the corresponding methods and solutions to the problem are proposed, including: improving the professional literacy of relevant technical practitioners, establishing and improving a smart distribution network supervision mechanism, and strengthening relevant maintenance of smart distribution network equipment. Optimize planning quality. Enable power companies to fully meet the development needs of modern society, better ensure the safety of power grid projects, and effectively plan urban power grids.