A power check mobile application system for power marketing and a working method thereof are disclosed. The invention relates to the power check mobile application system for power marketing. Due to the lack of management of the information of photos and videos taken in client field operation, the afterward query and confirmation are difficult. The system comprises a host computer and a portable handset. The handset is provided with a wireless communication module, a task receiving module which obtains an electricity use checklist, a line planning module, an infrared scanning module, a camera module, an electricity use check processing module, and a field data uploading module. The host computer is provided with a BOSS professional system which is provided with a mobile work platform module and a work order processing module. According to the technical program, the traditional working mode of needing multiple times of entry of a field and BOSS system interaction is changed, the space expansion and time extension of marketing power checking work are carried out, the working efficiency is improved, and the service level is improved.