The plate type stainless steel connector is used to bear the vertical load and horizontal load in the plane of the prefabricated sandwich insulation wall, and the needle type stainless steel connector is used to bear the horizontal load outside the plane of the prefabricated sandwich insulation wall.The flat connector and the pin connector are used together to finally realize the function of connecting the three structural layers of the prefabricated sandwich insulation wall (inner leaf wall, insulation board and outer leaf wall).