The invention relates to an intelligent charging system of expressways. The system comprises three parts, namely, expressway special signal launching towers, a vehicle-mounted special charging cell phone, and a toll-gate information receiving and identification system, wherein the vehicle-mounted cell phone can automatically roam at a running expressway section, has the voice function and also has the alarming function, so as to faciliatete the normal driving of a driver; special multi-point small power signal launching towers are arranged along the expressway so as to ensure that the whole expressway section has no signal blind areas; and two lanes of intelligent charging gate and a manual charging gate are arranged at the toll-gate, and the rod at the intelligent charging gate does not need to be put down under normal condition. The system is high in gate passing efficiency and low in energy consumption, not only is the charging quality ensured, but also the environmental pollution is reduced, and moreover the vehicle running security is improved, so that the system is a management system with energy conservation and emission reduction, and development of relevant industries is promoted.