Building external wall panel connecting structure

According to the building externally-hung wall plate connecting structure, a locally-thickened protruding part is arranged on the lower middle portion of an externally-hung wall plate, the lower end face of the protruding part is supported by a plurality of groove-shaped brackets, the groove-shaped brackets are fixedly connected with a building wall body through embedded bolt assemblies, and each embedded bolt assembly comprises a bolt embedded in the building wall body, a base plate and an anchoring nut. The local supporting thickened concrete structure is arranged on the back face of the externally-hung wall plate, the thickened concrete structure is supported by the connecting box fastened on the building structure, a hidden supporting structure of the externally-hung wall plate is achieved, the connecting structure is prevented from being exposed to the sun and rain by the external environment, and the externally-hung wall plate has the advantages of being convenient and fast to construct and firm and rel