Lower rail structure of sliding door

The utility model discloses a lower rail structure of a sliding door, which belongs to the technical field of sliding doors and comprises a rail component, a plurality of drain holes are arranged on the lower portion of the rail component, outer frames are mounted on two sides of the rail component, a plurality of discharge holes are arranged at the bottoms of the outer frames, and a fixing plate is arranged below the rail component. A first lifting device is arranged between the rail assembly and the fixing plate, a second lifting device is installed at the position, close to the center, of the first lifting device, and cleaning and collecting devices are arranged on the two sides of the rail assembly and located below the outer frame. Through the arrangement of the first lifting device and the second lifting device, a worker can adjust the overall height of the structure to a certain degree through the matching of structures such as the lead screw and the outer sleeve body when needed, so that the working r