Novel high-performance plastic additive

The invention relates to a novel high-performance plastic additive which is prepared from the following raw materials in parts by weight: 20-35 parts of light calcium carbonate powder, 3-4 parts of methacrylate, 0.5-1.2 parts of organic tin, 2-4 parts of calcium chloride, 4-6 parts of activated zinc oxide, 3-5 parts of silicon oil, 4-7 parts of organic antimony, 0.6-1.3 parts of sodium carbonate, 2-4 parts of methyl salicylate, 3-4.2 parts of glass fiber, 3-6 parts of artificial mica, 5-8 parts of propanediol, 2-4 parts of sorbitol, 6-9 parts of calcium oxide, 8-12 parts of stearic acid, 3-7 parts of filler and 4-7 parts of kaolin. The novel high-performance plastic additive effectively reduces the decomposition rate of the plastic, prolongs the decomposition time, improves the processing flowability, and has the advantages of high thermostabilization efficiency and low cost.