The invention discloses a novel high-performance glass fiber and magnesium fireproof board which comprises the following components in percentage by mass: 30%-35% of magnesium oxide, 45%-50% of magnesium chloride, and 15%-25% of saw dust. The fireproof board has the characteristics of being fireproof and waterproof, soundproof and heat-insulating, energy-saving and environment-friendly, non-toxic and smell-free, capable of being sawed, nailed and stuck, and long in service life, and the intensity and durability of a fireproof area of a building can be enhanced.