Flame-retardant surface coating for solid rocket engine and preparation method of flame-retardant surface coating

The invention belongs to the field of coatings, and particularly relates to a solid rocket engine flame-retardant surface coating and a preparation method thereof. The flame-retardant surface coating for the solid rocket engine comprises a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: 25 to 30 parts of phenyl modified 107 glue, 8 to 10 parts of fumed silica, 15 to 20 parts of flame retardant, 10 to 20 parts of hollow glass beads and 25 to 35 parts of solvent oil; the component B is prepared from the following raw materials in parts by weight: 85 to 95 parts of tetraethoxysilane and 5 to 15 parts of a catalyst. According to the flame-retardant surface coating for the solid rocket engine, through scientific proportioning of the base material, the filler and the auxiliaries, the dispersity is good, the mechanical strength is high, the flame-retardant grade reaches V0 or above, the flame-retardant surface coating is relatively light, the ad