To address the issue of conventional oil containment booms being susceptible to oil spill escape under strong wind and wave conditions, a spill containment and wave attenuation system based on a wave absorbing net structure was designed. A hydrodynamic numerical model of the wave-absorbing system was established using STAR-CCM+ software, incorporating the Volume of Fluid (VOF) two-phase flow model and an equivalent resistance model to analyze the influence of wave-absorbing net structural parameters on system performance. The wave attenuation effects of the net under different porosity conditions were systematically simulated. Results indicate that when the porosity ranges from 0.82 to 0.85, the system achieves a stable wave attenuation efficiency of approximately 90%, while avoiding the excessive resistance and engineering costs associated with overly dense mesh configurations. Offshore field tests demonstrated that the system exhibits favorable deployment operability and wave stability, with measurable wave attenuation capabilities under actual sea conditions. These findings provide valuable reference for the structural design and engineering application of spill containment and wave attenuation system.