The offshore leakage oil accidents bring great harm to society, economy and ecology. The paper presents a new technology of reclaiming of offshore underwater leakage oil to achieve the aim of emergency treatment, which can improve the emergency speed to win some valuable time for marine casualty treatment, and meanwhile can reduce environmental pollution loss caused by the leakage oil. Designed two groups of physical model test, the test results show that: The technical principle is feasible in theory, and the flexible collection tank in stress has more advantage than the rigid one. It is very significant to promote marine oil spill emergency response ability, and also lays a solid foundation for further forming series of technology and equipments.