In order to improve the quality of electric power marketing service, this paper puts forward the research of electric power marketing service system based on Alipay applet. The architecture of Alipay applet system for online channel of electric power marketing designed in this paper mainly includes three aspects: marketing mobile application module, application management module and integrated management module. The functions of electric power marketing service system are designed, including homepage management, user payment and withholding, electronic bill, electric power service and other functions. This article fully relies on Alipay channel's real-name authentication members, small program service construction and Internet promotion capabilities, and builds Alipay small program system. By taking Alipay as the online service position of power marketing, it can greatly improve the overall service level of power marketing, enhance customer satisfaction and help optimize the business environment.