The invention discloses a landing door device of a fire elevator, wherein a roller wheel on a landing door suspending board comprises a roller wheel main body and a bearing; the roller wheel main body comprises a metal retainer ring and a metal wheel core with a through hole; a Teflon ring which is in a tensioning state is arranged on the outer ring of the metal wheel core in a sleeved mode; rolling patterns on the surface of the Teflon ring are embedded into the Teflon ring; first grooves which are distributed in annular mode around the middle axis of the Teflon ring are formed in the two side surfaces of the Teflon ring; the metal retainer ring is fixedly arranged on a first limiting step in the sleeved mode, and is folded with the metal wheel core to press the Teflon ring until the first grooves in the two side surfaces of the Teflon ring are flattened by pressing; a R slot is formed in the outer ring of the Teflon ring; and guide rails on an upper ridge bottom plate extend into the R slot of the Teflon ring to fit to the slot wall of the R slot. The landing door device solves the technical problems of an elevator landing door device stably used in a fire elevator system, and has the characteristics of resisting impact and preventing drop.