The invention relates to a multimedia information processing system used for transformer substation maintenance operation guidance. The system comprises a network server, a characteristic identification tag and mobile equipment, wherein the network server is used for storing operation guidance data of each electric power equipment; the electric power equipment is the electric power equipment in a transformer substation; the characteristic identification tag is arranged on the electric power equipment and stores an equipment coding corresponding to the electric power equipment; the mobile equipment is connected to the network server and is used for establishing data connection with the characteristic identification tag, acquires the equipment coding of the electric power equipment and acquires and displays the operation guidance data corresponding to the electric power equipment on the network server according to the equipment coding. Compared to the prior art, by using the system of the invention, necessary education training can be performed on an electric power maintainer on site so that standardability during an electric power operation process is guaranteed; and because of standard operation actions, personal injuries of the electric power maintainer and damages of the electric power equipment can be reduced.