Steel structure beam column and splicing assembly thereof

The invention discloses a steel structure beam column which comprises an upper beam column body, a lower beam column body and a cross beam assembly on one side of the beam columns, butt joint plates are arranged on the peripheries of the connecting ends of the upper beam column body and the lower beam column body respectively, a splicing assembly is arranged between the upper beam column body and the lower beam column body, and one beam column body is limited by the splicing assembly to be spliced with the other beam column body. After the two beam columns are spliced, the butt joint plates correspond to each other up and down, the cross beam assembly comprises a main beam and secondary beams, one end of the main beam is fixedly connected with one beam column, the secondary beams are fixed to the two sides of the main beam and extend outwards, connecting plates are arranged on the two sides of the main beam, and the secondary beams are connected with the connecting plates through high-strength bolts; when the