A visual data operation method, system, and device, and a medium for one or more pieces of data, creating one or more corresponding value objects, and arranging the one or more value objects as a tree structure; and for the one or more value objects, creating corresponding database records, and defining fields of the database records by the one or more value objects. Data and database records correspond to each other and are mutually converted by using value objects. A developer only needs to arrange the value objects as a tree structure, and a system can automatically complete remaining data operations subsequently, including creating database records and synchronizing database records, and the like. A developer can quickly design a data storage format by taking a user as a unit, and the design presentation is intuitive and understandable to other developers.