Flame-retardant masterbatches are functional masterbatches formulated using polyolefins as a carrier, blended with highly effective, eco-friendly flame retardants, synergists, and dispersing agents. They are primarily used to enhance the flame-retardant and smoke-suppressing properties of plastic materials. When added, they effectively delay combustion, reduce flame spread, minimize the generation of melt droplets and smoke, achieve the corresponding flame-retardant rating, and meet safety requirements in industries such as electronics, packaging, and building materials. Suitable for a variety of substrates such as PE, PP, and ABS, as well as films, injection-molded parts, and sheet products, these masterbatches offer stable flame-retardant performance and excellent dispersion. They have minimal impact on the mechanical properties and processability of the material, are halogen-free, environmentally friendly, low-toxicity, and low-smoke. With moderate loading levels and ease of use, they are an essential functional masterbatch for enhancing the fire safety of plastic products.