Abstract: With the wide application of artificial intelligence, automatic control and network communication technology in the field of ship, the monitoring system of ship’s engine room becomes more intelligent, digitized, and modular. The Beidou satellite navigation system developed in China has the functions of location, navigation, time service and two-way short message communication, which is especially suitable for the field of ship monitoring. Temperature monitoring is an important part of engine room monitoring. In order to solve the problem of inconvenient temperature monitoring and find the way to control in engine room, a ship’s engine room temperature monitoring system based on Beidou and embedded system is proposed. The temperature collection system, ARM processor and its peripherals, equipment control devices and WiFi communication modules are used to monitor and control the temperature of the ship's engine room in real time. With the Beidou communication system as the medium, the temperature data collected from the engine room and the ship's position are transmitted to the remote monitoring terminal in real time. Not only does it simplify the hardware and software of the system, but also it enhances the real-time and operability. At the same time, it improves the confidentiality and stability, and has good prospects for development.