In view of the limitations of a single method for solving the full frequency domain noise of large-scale offshore engineering structures, on the basis of introducing the basic principles, different types of software are used to solve the platform noise to realize the full frequency domain noise analysis of large-scale offshore platforms. Combining the Finite Element Method (FEM), Boundary Element Method (BEM) and Statistical Energy Analysis (SEA), the ESI-VA ONE and NASTRAN software is used to solve the established model. Considering the effects of airborne sound, structural sound and sound-solid coupling, the noise analysis of the whole frequency domain is completed on the basis of different noise propagation, the noise distribution of the entire platform is obtained, and the noise conditions including windshield wall conditions and non-windshield wall conditions are analyzed. Although the solution is difficult, the practical result of this technology is feasible and meets the design requirements, standards and specifications. It is of certain guiding significance and reference value for the acoustic vibration analysis of large offshore engineering structures.