The oil storage tank bottom plate monitoring system is designed to detect defects such as corrosion, cracks, and leaks on the bottom plate of oil storage tanks. It meets the three essential safety requirements: explosion-proof, electrical-proof, and waterproof. The system can monitor and locate defects in real time, integrating with an IoT management platform for intelligent monitoring and maintenance. It is capable of monitoring storage tanks with a diameter of 60 meters, achieving a defect identification accuracy of over 90% and a positioning accuracy of less than 30 cm. The system can also issue early warnings based on the severity of the defects;