External heat insulation structure for polystyrene board external walls

The utility model relates to an external heat insulation structure for polystyrene board external walls, which consists of a decorative layer, an alkali-resisting fiberglass gridding cloth layer, a polystyrene plastic foam heat insulation board, an adhesive layer and an interface treating mortar layer form outside to inside. The polystyrene plastic form heat insulation board is integrally adhered with an external wall body via the adhesive layer, the interface treating mortar layer and nylon expansion bolts. Each nylon expansion bolt consists of a screw and a nylon expansion sleeve with a disc, the nylon expansion bolts are pressed in matching holes, which are hammered and drilled in advance so as to realize integration of the polystyrene plastic foam heat insulation board and the external wall body, of the polystyrene plastic foam heat insulation board, the depth of each nylon expansion sleeve with the disk entering the external wall body is larger than 60mm, the nylon expansion sleeves are screwed with the