Lower horizontal aluminum section bar of sliding door

The invention belongs to the field of building materials and discloses a lower horizontal aluminum section bar of a sliding door. The lower horizontal aluminum section bar comprises a lower horizontal body, wherein a groove is formed in the top of the lower horizontal body, horizontal plates located between two side walls is arranged at the bottom of the groove, two cavities are formed between two side walls of the groove and the horizontal plates, an arc-shaped groove is formed in the middle of the other side of each horizontal plate, and a small upper horizontal strip and a small lower horizontal strip are respectively arranged on two side walls of the lower horizontal body and are located under the horizontal plates. Opposite meshing patterns are arranged at the opening position of the groove. A composite ceramic layer is arranged on the outer side of the lower horizontal body. The lower horizontal aluminum section bar has the advantages of being simple and convenient in structure and firm in connection.