The invention discloses an elevator landing sill structure. A guide rib plate perpendicularly extending upwards to a slot opening from a slot bottom part of a sliding slot and extending along a length direction of a sill as well is arranged in the sliding slot of the sill; non-metal pin rollers having central axes being perpendicular to the slot bottom part of the sliding slot and arranged along the length direction of the sill are arranged at two sides of the guide rib plate in the sliding slot; a metal support extending along the length direction of the sill, having a cross section being in a Y shape, and having a sectional material with a certain thickness is arranged at the upper ends of the two rows of non-metal pin rollers; the two rows of non-metal pin rollers are fixed to two ends of a furcation part of the metal support; and the furcation part of the metal support is at a pre-dilation state, so that pin roller surfaces of the two rows of non-metal pin rollers connected to the metal support are ensured to be tightly close to the guide rib plate. The elevator landing sill structure solves the technical problem so as to 'improve the operation stability of an elevator landing door system', so that the life and property security of elevator passengers can be directly improved.