The invention provides an electric power transaction retail package management system and method with a user-defined revenue mode, and belongs to the technical field of power market retail package management and settlement systems. The system comprises a user login module, the system comprises a package template management module, a first display module, a historical data management module, a second display module, a custom package selectable content management module, a custom package generation module, a custom package trial calculation module, a third display module, a custom package auditing module, a custom package settlement module and a fourth display module. According to the invention, self-defined generation of the retail service package between the electricity selling company andthe user can be realized; and settlement and charging can be carried out on the signed package efficiently and accurately, the service requirements of an electricity selling company and users are met, the single structure of the package is broken through, the package is enriched, the user stickiness of the electricity selling company is improved while the package is oriented to user categories, and the flexibility of the retail market is improved.