The utility model relates to a sloping core supporting system, which comprises a plurality of upper connecting pieces capable of being fixedly arranged on an upper floor, a plurality of lower connecting pieces capable of being fixedly arranged on a lower floor, and a plurality of floor bearing plates, wherein the upper end and the lower end of each floor bearing plate are respectively and fixedly arranged on each upper connecting piece and each lower connecting piece, and the floor bearing plates are arranged on the same slope side by side. The upper connecting pieces and the lower connecting pieces of the sloping core supporting system are respectively and fixedly arranged on the upper floor and the lower floor, the upper end and the lower end of each floor bearing plate are respectively and fixedly arranged on each upper connecting piece and each lower connecting piece, and the floor bearing plates are arranged on the same slope side by side, so that a supporting system is formed before casting is carried out and does not need to be dismantled after casting is carried out, as a permanent stress system, the structure is stable, and the operation is simple and fast, the manufactured floor bearing plates can be directly mounted on the upper floor and the lower floor, a scaffold is not needed, the construction procedures are fewer, the construction operation quantity can be effectively reduced, and the construction period is shortened.