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Commercial vehicles carry a lot of work such as logistics, freight, commuting and so on. The rapid development of commercial vehicles also brings problems such as road congestion and environmental pollution. The real-time remote monitoring of vehicle safety and exhaust emissions, as well as the intelligent network connection system for commercial vehicles, has become an urgent demand for commercial vehicle regulatory authorities. This paper designs a commercial vehicle intelligent terminal system based on SAE J1939, and introduces the frame format of SAE J1939. The system adopts 32-bit low-power microcontroller STM32F103C8T6 based on Cortex-M3 core as the main control chip, which uses commercial vehicle CAN (Controller Area Network) bus and various sensors to realize vehicle information collection and processing. It realizes the information interaction between the intelligent terminal and the cloud server through GPRS wireless communication. According to the user’s demand, the obtained information includes the vehicle speed, the remaining fuel amount of the vehicle fuel tank, the current GPS (Global Positioning System) position, and etc. The proposed system has the advantages in real-time and accuracy, which solves the limitation that the traditional OBD (On Board Diagnostics) vehicle diagnosis requires professional technicians and special equipment to read the vehicle information, and has built the ability of the remote diagnose system for commercial vehicles.