Node structure in fabricated building

A node structure in a fabricated building comprises two prefabricated concrete members, and a plurality of connecting blocks are pre-buried in at least two opposite end sides of the end faces of the butt joint ends of the two prefabricated concrete members in the length direction; the connecting block is of a rectangular shell structure, and a triangular connecting hole is formed in the middle of the front end face. The connecting blocks are embedded and fixed to the end faces of the butt joint ends of the prefabricated concrete members correspondingly. The connecting plates are rectangular plates, two connecting through holes are formed in the middle of each connecting plate at intervals, and the connecting through holes are triangular; the unilateral fastening bolt assembly is composed of a screw, a nut and a limiting piece. The tail part of the screw rod is triangular; a hexagonal through hole through which the screw penetrates is formed in the center of the limiting piece, and the size of the hexagonal th