Taken an offshore CEPC platform jointly built by 110 kV high-voltage transmission and distribution equipment and oil and gas processing facility platform as an example, the platform structural model is established using SACS software to analyze the vibration generated by the operation of seven high-power water injection pumps arranged on the lower deck of the platform. The main analysis includes the whole modal analysis, local modal analysis near the transformer, and harmonic response analysis to determine their impact on the platform structure and high-voltage transmission and distribution equipment. The results show that the vibration response displacement caused by the water injection pump is relatively small, and the overall structural vibration frequency and the local structural vibration frequency of the transformer are far away from the working frequency of the water injection pump, making it difficult to generate resonance. The impact of the vibration on the local high-voltage transmission and distribution equipment can not be ignored, and long term vibration will affect the normal operation of the equipment. Providing vibration reduction measures for the high-voltage transmission and distribution equipment can provide important reference for subsequent engineering projects.