Expansion joint structure of ALC (autoclaved lightweight concrete) plate

The utility model discloses an ALC plate expansion joint structure which comprises an H-shaped protective shell, the protective shell is correspondingly arranged at the joint position of two adjacent ALC plates, the ends, close to each other, of the two ALC plates are inserted into abdominal cavities in the two sides of the protective shell respectively, and a side expansion joint with a certain gap is reserved between the side face of each ALC plate and a wing plate of the protective shell. A connecting supporting plate is slidably mounted in the abdominal cavity of the protective shell, one side plate face of the connecting supporting plate is attached to the end face of the ALC plate, and the other side plate face of the connecting supporting plate is connected with a web of the protective shell through a plurality of sets of springs arranged at intervals. The ALC board expansion joint is simple in structure and convenient to install, enough transverse and longitudinal expansion deformation space is reserv