LANDING DOOR SILL SYSTEM

A landing door sill system, comprising a sill body (1), a bottom support (2) supporting the sill body (1) from below, a plurality of reversing supporting assemblies (3) connected below the bottom support (2) and used for fixing the bottom support (2), and a first bolt assembly (4) used for connecting the bottom support (2) and the reversing supporting assemblies (3). The sill body (1) is provided with a guide groove (11) recessed downwards for guiding landing doors to move, and a mounting groove (13) having the opening facing downwards; a plate forming the guide groove (11) on the sill body (1) is a downwardly recessed plate (14); the bottom support (2) is provided with an upwardly extending mounting plate (21); the mounting plate (21) is inserted into the mounting groove (13); a relief space (23) is formed between the mounting plate (21) and the downwardly recessed plate (14); a part of the first bolt assembly (4) is located in the relief space (23). The sill body (1) is inserted and fixed in the bottom supp