The “Outline Development Plan for the Guangdong-Hong Kong-Macao Greater Bay Area” points out that it is necessary to cultivate and expand strategic emerging industries, create a number of strategic emerging industrial clusters with international competitiveness, and promote the development and growth of new materials and other industries into new pillar industries. Huizhou New Material Industrial Park is a specific measure to accelerate the development of a trillion-level industrial cluster of petrochemical energy and new materials and promote the high-quality development of the Guangdong-Hong Kong-Macao Greater Bay Area in response to the requirements of the Outline Development Plan for the Guangdong-Hong Kong-Macao Greater Bay Area. In order to implement the new development concept, the impact of deep-sea discharge on water quality of the new material industrial park's standard wastewater relying on the second wastewater discharge pipeline of Daya Bay Petrochemical Industrial Park was studied, and the three-dimensional current dynamic model was constructed to predict and analyze the scenarios of the outward migration distance of 6.5 and 8 km from the wastewater outlet, and the evolution law of pollutant discharge was studied, and the diffusion and concentration increment of surface, middle and bottom pollutants were calculated. The results showed that the influence range of wastewater discharge pollutants was very small, and the diffusion range of each pollutant concentration was 1871 m away from the boundary of Daya Bay Aquatic Resources Provincial Nature Reserve and Sea Turtle Nature Reserve, which met the requirements of the reserve and had little impact on the overall sea area. The three-dimensional current dynamic model used in this paper can be widely used in the simulation of pollutant concentration diffusion, and provide technical support and guidance for related engineering construction.