The invention discloses a cross beam device for guiding hot-rolled steel. The cross beam device comprises a rolling mill rack, wherein a guide beam is arranged on the rolling mill rack, and a cross beam device body is arranged on the guide beam; and the cross beam device body comprises a first cross beam, a plurality of supporting seats which are parallel to one another are fixedly connected to the upper end of the first cross beam, a plurality of telescopic rods are further arranged at the upper ends of the supporting seats, and the upper ends of the telescopic rods are further connected withfirst bases. According to the cross beam device, the heights of the first bases can be adjusted according to needs by adjusting the telescopic rods so than the first bases with different stepped shapes can be formed, and therefore first stair treads with different heights can be formed, the requirements of quantity and height of different hole types can be met conveniently, the operation is simple, and the first stair treads do not need to be replaced frequently; and when the hot-rolled steel with different hole types is guided, there is no need to disassemble a used step holder and then install a to-be-used step holder to guide the hot-rolled steel. The cross beam device is simple in structure and easy to use.