The invention discloses a transportation system for molten steel. The transportation system is used for transporting the molten steel in the primary melting-refining production flow. The transportation system for the molten steel comprises a primary melting span (100) and a refining span (200), wherein a primary melting furnace (101) is arranged in the primary melting span (100) and is provided with a steel tapping station (102); the refining span (200) is parallel to the primary melting span (100); an argon flushing station (103) and a refining furnace (201) are arranged in the refining span (200); the refining furnace (201) is provided with a plurality of refining stations (202 and 203); one steel tapping station (102) of the primary melting furnace (101) in the primary melting span (100) separately communicates with the plurality of refining stations (202 and 203) of the refining furnace (201) in the refining span (200) through multiple molten steel transportation lines (301 and 302); and molten steel ladle carts (400) are arranged on the molten steel transportation lines (301 and 302). According to the transportation system disclosed by the invention, the waiting of molten steel ladles is reduced, crow block interference is avoided, the operation cycle of the molten steel ladles is shortened, the problem that single refining station cannot realize online refining and continuous production is solved, the investment is less and the operation cost is low.