The invention provides a remote maintaining and monitoring system for a GYK. A hardware system of the remote maintaining and monitoring system comprises a user terminal, a server and a vehicle-mounted device, wherein the user terminal and the vehicle-mounted device are connected with the server through a communication link, the vehicle-mounted device comprises a vehicle-mounted main unit, the GYK, a GYK DMI and a remote control GYK, the vehicle-mounted main unit is used for receiving information uploaded to the server by the user terminal and sending vehicle-mounted updating information to the server, the GYK is used for receiving data transmitted by the vehicle-mounted device main unit through RS422, the GYK DMI is used for receiving data transmitted by the vehicle-mounted device main unit through a CAN bus, sending a sound-light alarm prompt message and displaying the current state of the updating data information and the content of notice information, and the remote control GYK is used for upgrading updating data, releasing a train order and sending the updating data and the train order to the GYK through a USB communication bus. According to the remote maintaining and monitoring system for the GYK, vehicle-mounted car traveling control over the GYK and upgrading of a DMI control program are achieved, and smoothness, reliability and safety of data transmission are improved.