The invention provides a truck overload real-time monitoring system based on Beidou Internet-of-vehicles. The truck overload real-time monitoring system comprises a truck overload detecting terminal, four suspension load detecting CAN nodes, a vehicle owner terminal and a remote monitoring platform. The suspension load detecting CAN nodes acquire a deformation signal and an angle signal through a resistance strain sensor and a six-axis gyroscope. The truck overload detecting terminal acquires vehicle position information and vehicle speed information through a Beidou GPS module. The remote monitoring platform determines whether overload or overspeed of the truck occurs. The truck overload real-time monitoring method comprises the steps of a), computing an inclination angle; b), acquiring deformation of a steel plate spring; c), calculating a load; and d), calculating a vehicle load. The system and the method of the invention can perform real-time detection and overload prompt on freight trucks, and furthermore can perform load capacity inspection and law breaking evidence acquiring without interference on normal driving of the freight truck. Furthermore the truck overload real-time monitoring method is a novel, high-efficiency and quick method for preventing overspeed and overload of the freight truck.