Steel rail zero-roll-gap finished product pass structure, rolling process and universal rolling mill

The invention belongs to the technical field of steel rail rolling, and particularly relates to a steel rail zero-roll-gap finished product pass structure, a rolling process and a universal rolling mill. The pass structure is composed of an upper horizontal roll, a lower horizontal roll, a head vertical roll and a bottom vertical roll; zero roll gaps are formed between the head vertical roll and the upper horizontal roll as well as between the head vertical roll and the lower horizontal roll on the side surface of the rail head of the steel rail; or zero roll gaps are formed between the bottom vertical roll and the upper horizontal roll and between the bottom vertical roll and the lower horizontal roll on the side surface of the rail head of the steel rail; and the upper horizontal roller, the lower horizontal roller, the head vertical roller and the bottom vertical roller are correspondingly assembled to form a steel rail finished product front hole pattern. Horizontal roller shifting caused by head and bott