Preparation method of reinforced flame-retardant hard polyurethane composite material

The invention relates to a preparation method of a reinforced flame-retardant hard polyurethane composite material, and is characterized in that the preparation method comprises the steps: at the normal temperature, adding fully-dried polyether polyol into a reactor, then adding a flame retardant, triethanolamine, silicone oil, water and organic tin, mixing evenly, after mixing evenly, gradually adding a reinforcing material, fully mixing with a powerful stirrer, after the reinforcing material is fully mixed, adding dried isocyanate, powerfully stirring to start a reaction, when observing the starting of generation of a few air bubbles, quickly filling a mold with the material, assembling the mold, allowing the chemical reaction to be rapidly performed, then carrying out expansion setting, curing, mold opening and other steps to obtain the finished product, namely the reinforced flame-retardant hard polyurethane composite material. The product is widely applied in the fields of high-speed rails, industry, construction industry, transportation industry, navigation industry, aerospace industry, sport articles and the like.