The halogenated flame retardant used in plastic products is an excellent flame retardant with good flame retardancy, therefore, it is widely used in the production of plastic products. However, the halogenated flame retardants contain highly migratory and toxic organic chlorides, organic bromides, and other substances, which can cause harm to human health and the natural environment. Therefore, establishing a fast and convenient method for detecting the halogen content in plastic products is of great significance for quality monitoring, recycling, and processing of plastic products.