Despite its essential uses, plastic has become a serious threat to the environment due to excessive consumption and improper management. International cooperation and the creation of efficient legal mechanisms are of vital importance to face this global challenge. This study has been done with the aim of explaining the position of international environmental law in improving the management system of plastic products, analyzing legal obstacles and providing new strategies to reduce the pollution of plastics and protect the environment. In other words, this research, with a descriptive-analytical approach, examines the role of international environmental law in improving the management of plastic products and reducing legal challenges. The findings show that the existing documents such as the London, Marple and Basel Conventions, despite their influence, are not enough to solve the crisis due to the dispersion of regulations and the weak guarantee of implementation. Also, the development of an international framework with strong regulatory mechanisms, along with the responsibility of producers and the comprehensive participation of countries, is considered a basic solution to reduce plastic pollution. The proposed solutions include drafting a comprehensive agreement centered on the circular economy, strengthening international standards and developing regulatory mechanisms. Also, it is necessary to integrate principles such as "extended producer responsibility" and "polluter pays" in national laws. The success of these solutions requires the tripartite cooperation of governments, industries and civil society.