Provided are an electric marketing customer service mobile application system and a work method thereof. Traditional managing software which can only be used in a local area network of an electric power company greatly restrains site communication and improvement of the service quality. The electric marketing customer service mobile application system comprises an upper computer and a portable handheld set. The handheld set is provided with a wireless communication module, an input module, a picture taking module, a display module and a service handling module. The upper computer is provided with a BOSS professional system. The BOSS professional system is provided with a mobile operation platform module, a wireless communication module and a service processing module. The service processing module is used for processing service handling application from the handheld set and feeding the processing results back to the service handling module of the handheld set through the wireless communication module. The technical scheme of the electric marketing customer service mobile application system accepts a mobile operation method, can carry out service handling of new installation, capacity expansion and change of low-voltage residents in site and can improve the site service capacity of marketing service customers and excellent service level.