External wall insulation board capable of being assembled

The utility model relates to the technical field of insulation boards, and discloses a splicable external wall insulation board which comprises an insulation board body, two connecting rods are fixedly connected to the bottom of the right side of the insulation board body, mounting grooves are formed in the left side and the right side of each connecting rod, and sleeves are fixedly connected to the sides, far away from each other, of the two mounting grooves. Springs are arranged in the two sleeves correspondingly, cylinder sleeves are slidably connected to the interiors of the two sleeves correspondingly, first rotating plates are rotatably connected to the left side and the right side of the connecting rod correspondingly, second rotating plates are rotatably connected to the tops of the two first rotating plates correspondingly, and a limiting assembly is arranged at the bottom of the right side of the heat preservation plate body; a fixing groove is formed in the top of the left side of the insulation bo