Magnesium hydroxide masterbatch is a functional masterbatch mainly composed of magnesium hydroxide. It is usually made by surface modification of high-purity magnesium hydroxide and then mixed with carrier resins of PE, PP and other additives. By converting magnesium hydroxide into masterbatch form, it solves the problems such as poor dispersion and poor compatibility with the base material that exist in the powder form of magnesium hydroxide.