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With the continuous expansion of the scale of modern granary, its temperature measurement system requires not only to simplify the field wiring but also to transmit data in a long distance, so as to realize centralized monitoring. A kind of granary temperature measurement system based on CAN bus and DS18B20 sensor is designed. Using the characteristics of CAN bus and DS18B20, the simplification of field wiring and the long distance transmission of data are realized. The design of the software and hardware of the temperature measurement system is introduced in this paper, which realizes the simplification of the field wiring of the granary and the long distance transmission of the data. The experiment shows that the system is well adapted to the demand of the granary temperature measurement system, and has the characteristics of low cost and high reliability.