The invention discloses a process for laying a deepwater S-shaped submarine pipeline, which comprises the following steps of: firstly, adjusting a pipe carrying frame and transferring a pipeline after a pipe laying ship is in position; secondly, positioning the pipe laying ship at a given position on the sea and arranging a starting anchor; and thirdly, laying the pipeline, namely, (1), transporting the pipeline to a welding station for welding, (2) performing flaw detection on the pipeline, coating an anticorrosion layer and placing a buckling detector, (3) positioning and moving the ship dynamically, passing the pipeline through a stretcher and the pipe carrying frame, and forming an upper bending section under the guidance of the pipe carrying frame, and (4), continuously lowering the pipeline, positioning and moving the ship dynamically, and releasing the pipeline until the pipeline is lowered to a seabed. General monitoring is performed all the time in all steps of laying the pipeline. By using the power system of the pipe laying ship and matching the stretcher and the starting anchor to lower the pipeline, the submarine pipeline can be laid in deepwater, the laying speed of the submarine pipeline and working efficiency are increased, and the safety and the reliability of laying the submarine pipeline are improved.