The invention relates to a mobile application information security system for a power system, and solves the shortage of the prior art. The technical scheme is as follows: the mobile application information security system comprises internal and external networks of the national grid, a power wireless private network and an intelligent mobile terminal; the intelligent mobile terminal is in communication connection with the internal and external networks of the national grid through the power wireless private network; the intelligent mobile terminal comprises a security encryption chip, a face recognition module and a private network communication module; the private network communication module is connected with the face recognition module and the security encryption chip; and the private network communication module is in communication connection with the power wireless private network. The power wireless private network can realize two-way transmission of data, voice and video. Just because of the specificity, the confidentiality and security of data transmission can be guaranteed.