Building insulation board with waterproof function

The utility model discloses a building insulation board with a waterproof function, which comprises an insulation board body, the top and the bottom of the right side of the insulation board body are provided with mounting grooves, the top and the bottom of the left side of the insulation board body are fixedly connected with mounting blocks matched with the mounting grooves for use, and the insulation board body comprises a protective shell. Through the arrangement of the waterproof layer, the first heat preservation layer, the flame-retardant layer, the sound insulation layer and the second heat preservation layer, the waterproof effect is achieved, the flame-retardant, heat preservation and sound attenuation effects are achieved, a house can be better protected, practicability is enhanced, through the arrangement of springs, the heat preservation effect is improved, and the service life of the house is prolonged. According to the heat preservation plate convenient to assemble, the damage to a wall body cau