The invention discloses a logistics freight rate automatic calculation system. The system comprises a terminal all-in-one machine and a central processing system; the terminal all-in-one machine comprises a weighing module, a volume measurement module, a printing module, a computer host, an input display module, a power source and a data transmission module. According to cargo measurement and input volume, weight and transportation distance, the working method of the logistics freight rate automatic calculation system performs pricing with four pricing modes of bulky cargo drayage fixed price, linear accumulation between the bulky cargo volume and the distance, heavy cargo drayage fixed price and linear accumulation between the heavy cargo weight and the distance. According to the logistics freight rate automatic calculation system, cargo consignment links are greatly simplified, and human resources and time of logistics companies and clients are saved. Use of paper receipts is reduced, and environmental protection is achieved. Real-time data of a booking note are uploaded, and processing delay caused by procedure running of the logistics companies is reduced. The cargo weight is read by a machine, and reading is objective and accurate. The data of the booking note are stored in a mass mode, and the trouble for managing the paper receipts is saved. The cargo freight is calculated automatically, quickly and accurately.