The cargo hold water inlet alarm system is suitable for the water tanks of bulk carriers and special ships. The system consists of a liquid level sensor and a general display device. The liquid level sensor is installed in the monitored cargo hold and other monitored compartments, detecting the water level through direct contact between water and the liquid level sensor. When the water level at the sensor reaches the predicted and main water levels, it triggers sound and light alarms, indicating that there is water in the cargo hold or monitored compartment.