The invention provides a hot-rolling rough mill structure, which is applied to the technical field of hot-rolling rough mills and used for improving the utilization efficiency of rolls and reducing loss of rough rolling backup rolls. The hot-rolling rough mill structure comprises a plurality of backup rolls (1) and a plurality of rolls (2), each two rolls (2) are parallel to form a roll group (3), each roll (2) fits with one backup roll (1), a roll surface (10) of each backup roll (1) is of a curve structure, and the curve structure of each roll surface (10) is a negative convexity structure recessed to a curve (4) of each backup roll. By the aid of the hot-rolling rough mill structure, stable and continuous production of a hot-rolling rough mill can be reliably and technically guaranteed, the maximum roll contact stress of the backup rolls is smaller than that of backup rolls in the prior art, the contact length of the backup rolls are larger than that of the backup rolls in the prior art, and a pressure peak is eliminated, so that the utilization efficiency of the rolls can be improved, loss of the rough rolling backup rolls is reduced, and the rolling tonnage of the rolls in operation is effectively increased.