In order to solve the problem of cement pouring in the jacket steel piles, a device for cleaning cement in the jacket steel piles suitable for under water operations was studied. The advantages, disadvantages and applications of various cement crushing methods were compared and analyzed.Combined with the underwater operating environment, the method of cleaning cement in the jacket steel pile based on the principle of high-pressure water jet was feasible. The cement cleaning device in the steel piles of the offshore oil platform was designed, which included feed water pump, high pressure water pump, confluence block, hydraulic power unit, hydraulic console, angle display device, air supply power unit and high pressure water nozzle.The results show that the device can be used to effectively solve the engineering problem of clean the cement in the jacket steel piles of the off shore oil platform.