The invention relates to a connection system for transporting molten iron to a steelshop through a rail and an improvement method thereof, and belongs to the field of metallurgy transportation. The system and the improvement method comprise a blast-furnace casting house, an iron receiving line under a furnace, and a molten iron transporting trunk line connected sequentially; the molten iron transporting trunk line is connected with the steelshop through reladling lines or empty/heavy tank handing lines; the at least two reladling lines or the empty/heavy tank handing lines are arranged in parallel; the front ends of the reladling lines or the empty/heavy tank handing lines are connected with the molten iron transporting trunk line; the back ends of the reladling lines or the empty/heavy tank handing lines communicate with a transferring vehicle; and if the reladling lines exist, reladling stations are arranged in a matching way. According to the scheme, the short circuit layout for transporting the molten iron to the steelshop through the rail is realized, the influence of rail tracks on the layout plan of a plant of the steelshop is reduced, the engineering investment is reduced,and the connection system for transporting the molten iron to the steelshop through the rail and the improvement method thereof have good economic and social benefits.