Currently, many operations are carried out manually on farms for raising livestock. In particular, it does not use equipment to understand the condition of animals, but relies only on the farmer’s perspective. If information can be obtained by monitoring farm animals, manager can determine the behavior of the animals and use this information to predict the health of the animals. In this paper, we propose a livestock monitoring system based on WSN. The proposed system can monitor farm animals using IoT equipment and cloud platforms. A collar was mounted on the neck of an animal using IoT equipment, and the activity of the livestock was monitored. Farming man- ager can supervises live information by transmitting livestock observation information to cloud platforms. Through actual implementation, we verified that the proposed system can monitor animals on farms in real time.