ANSYS finite element method of numerical calculation combined with theoretical calculation method is used for the strength analysis of the corroded submarine pipeline. The effects of different corrosion pit depths, aspect ratios of the corrosion pits, and arrangement and spacing of two corrosion pits on the maximum stress of the pipelines are compared. It is concluded that: the corrosion depth is the most critical factor, the deeper the corrosion and the greater the aspect ratio are, the more obvious the stress amplification caused by corrosion is; when the distance between two corrosion pits exceeded certain critical value, the interaction between the corrosion pits can be ignored; the critical distance before the pipeline yielding is longer than that after the pipeline yielding. The strength of the constructed pipeline in shallow sea area is analyzed, and it is concluded that only considering the even corrosion is not accurate enough for the calculation, the stress concentration caused by the corrosion should also be considered. The research provides guidance and reference for the strength check of corroded submarine pipeline in the future.