With the acceleration of my country’s urbanization process and the continuous development of technology, many farmlands have launched online agricultural projects. The emergence of online farmlands has broken the limitations of traditional farmland farming methods and economic models, providing potential and possibilities for protecting food diversity. This article will analyze the application methods and application advantages of interactive design in online farmlands, propose issues that should be paid attention to in the construction of online interactive farmlands, and think about the future development direction and space of online agricultural interaction, aiming to propose ideas and preliminary explorations for the future protection of food diversity and the sustainable development of urban agriculture in my country, and provide new ideas and new directions.