The invention discloses a steel-concrete structure hanging box which comprises a reinforced concrete base board and steel formworks fixed at the periphery of the base board, wherein the steel formworks are divided into steel side formworks and steel end formworks, cross beams are arranged at the tops of the steel formworks, a plurality of hole paths are distributed on the cross beams, the edges of the base board are provided with a plurality of draw bar holes, each draw bar hole respectively corresponds to each hole path, a vertical draw bar is arranged between each hole path and each draw bar hole in a penetrating way, both ends of the vertical draw bar are respectively anchored by draw bar nuts, the lower end of each vertical draw bar is connected with a steel wire rope, the other end of the steel wire rope is connected with the top ends of the steel formworks, and the steel side formworks and the steel end formworks are connected by bolts; when the steel-concrete structure hanging box is dismantled, the steel formworks can be dismantled only by dismantling the vertical draw bars and the bolts; for the steel-concrete structure hanging box and a dismantling method thereof, the dismantling of the steel formworks can be realized without the need of underwater operation of a diver, the construction danger is reduced, the dismantling workload is reduced, and the expense investment is reduced while the construction progress is accelerated.