Leakage in submarine oil and gas pipelines can result in financial losses and marine environmental pollution.Timely detecting,analyzing and locating leaks can minimize losses and strengthen pipeline quality control.In this paper,the leak detection system of submarine pipeline in offshore oil jetty projects was studied.By comparing and analyzing existing leak detection technologies,a practical application solution for the submarine pipeline leak detection system in offshore oil jetty projects was proposed.The combination of negative pressure wave method and flow balance method can improve the accuracy of leak detection and reduce false alarm rates,providing a reliable and efficient solution for the project.