A multiple insulation threshold for a subway platform door

The invention provides a multiple insulation threshold for a subway platform door, comprising a composite metal lining, a metal outer layer of the sill metal and a metal base, wherein the composite metal lining is fixed on the metal base, the surface adjacent to the metal base of the composite metal lining is a non-visible surface, and other surfaces of the composite metal lining are visible surfaces; at least a portion of that composite metal line is adhered to a visible surface of the threshold metal out layer; a first insulating layer is arranged between the composite metal liner and the threshold metal outer layer. A second insulating layer is arranged between the composite metal liner and the metal base. An insulating plate is arranged between the metal base and the composite metal liner. Through the multiple insulation structure of the threshold, the invention improves the insulation of the threshold, effectively guarantees the safety of the passenger passage area, has strong electric pollution resistan