A power marketing fitted sheet electrical connection system and a working method therefor relate to a power marketing system. At present, in a field inspection business, a marketing business application system needs to carry a paper document to a user site, and inspection content is manually filled, so that a large amount of time is consumed in the process and the inquiry and confirmation are inconvenient. The system comprises an upper computer and a portable mobile terminal, wherein the upper computer is provided with a marketing system, a mobile working platform module, and an updating and displaying module; and the mobile terminal is provided with a wireless communication module, a task receiving module, a fitted sheet electrical connection guiding module, a bar code scanning module, an infrared meter reading module, a relationship establishment module, a position collection module, and a site data uploading module, used for uploading fitted sheet electrical connection data to the upper computer after finishing site work. According to the technical scheme, a traditional power marketing and measurement working mode is broken, and traditional fitted sheet electrical connection business work finished by operations of a power marketing private network client is transferred to a customer site and can be finished anywhere and anytime, thus greatly improving the working efficiency.