Exterior wall external insulation structure with thermoset polystyrene foam board

The utility model discloses an exterior wall external insulation structure with a thermoset polystyrene foam board. The exterior wall external insulation structure comprises a base course wall and an insulation layer fixedly arranged on the outer surface of the base course wall; the main body of the insulation layer is the thermoset polystyrene foam board; the thermoset polystyrene foam board is manufactured by pre-expanding a high-quality expandable polystyrene raw material, then performing composite wrapping by matching phenolic resin and special fire retardant, molding, curing, and then, molding after cutting. According to the exterior wall external insulation structure disclosed by the utility model, the thermoset polystyrene foam board can be effectively prevented from fusing, flowing and dropping after catching fire, and therefore the phenomenon that the flowing matter of the thermoset polystyrene foam board supports combustion and burns under the constant attack of an external force fire source is avoi