The invention provides an intelligent cloud service system and a device for a fast-charging network of an expressway. The system comprises charging devices arranged on an expressway, and a cloud server. All the charging devices are connected with the cloud server through a network. The working mode of the cloud server is as follows: for each target charging device, correspondingly adjusting the maintenance plan of the target charging device according to the current state of the target charging device; obtaining a corresponding maintenance scheme for each charging device with the current statethereof to be faulty according to the current operation information of the faulty charging device and based on a maintenance knowledge base. For charging devices in abnormal state, the charging devices are timely inspected or maintained. Therefore, the break-down probability of devices is reduced, and the utilization rate of devices is improved.