A power distribution network equipment maintenance system based on mobile network security authentication includes a distribution network terminal device, an intelligent mobile device, a web service on-line platform and a background maintenance website. A maintenance mode of a distribution network industry terminal is improved, and flexibility of the intelligent mobile device and convenience of wireless communication are fully utilized to perform operation of browse control of the distribution network terminal device, thereby greatly improving efficiency of staff. The power distribution network equipment maintenance system provided by the invention utilizes an on-line security authentication technology based on a user ID being matched with an MAC address to verify legality of the intelligent mobile device and the user, and utilizes a Bluetooth pairing code encryption method to establish securely encrypted wireless communication connection, thereby ensuring safe reliability of the maintenance system.