Pollution in the oceans is caused by plastic waste, industrial waste, oil spills and various other pollutants. While this pollution negatively affects marine life, it also negatively affects human health and the economy. Pollution in the oceans causes the death of marine creatures, the deterioration of ecosystems and the pollution of sea water. Plastic waste poses a great threat especially to marine creatures, and the amount of plastic in the oceans is increasing day by day. This situation destroys the habitats of marine creatures and negatively affects the food chain. Additionally, pollution in the oceans also threatens human health. Contaminants in seawater can contaminate seafood consumed by humans and thus adversely affect human health. Additionally, pollutants in seawater can have long-term effects on humans. Urgent measures must be taken to combat and reduce pollution in the oceans in the future. International cooperation and solution-oriented policies are required to reduce plastic waste, control industrial waste and prevent other factors that cause marine pollution. Otherwise, pollution in the oceans will gradually increase and pose a greater threat to both marine life and human health.