The design of this device complies with the relevant regulations for detecting the liquid level and temperature of ship cargo. The device integrates liquid level and temperature monitoring, and can simultaneously monitor the liquid level and temperature inside the cabinet. The monitoring of liquid level and temperature adopts independent circuits, without mutual interference, stable and reliable. The device has multiple functions such as liquid level and temperature monitoring, display, alarm, and control, and is suitable for measuring and alarming the liquid level and temperature of storage tanks in oil tankers, chemical tankers, and other ships.