The invention discloses a high-calcium ash re-burning system. The high-calcium ash re-burning system comprises a reaction device and a high-calcium circulating ash dust removal and collection device,wherein the high-calcium circulation ash dust removal and collection device communicates with the reaction device and communicates with a boiler by a re-burning device so that high-calcium ash entersthe boiler for re-burning, and the boiler also communicates with a re-burning collection device. Therefore, high-calcium ash after semi-dry desulfurization of a circulating fluidized bed is collectedby a dust collection device and then is transmitted to a fluidized bed boiler furnace for re-burning through a re-burning pipeline by the high-calcium re-burning device, and the calcium content in theash after re-burning is greatly reduced, so that the activity is improved, and the comprehensive utilization condition of the ash is completely achieved. By the high-calcium ash re-burning system, secondary utilization of calcium in the high-calcium ash after the semi-dry desulfurization of the circulating fluidized bed can be achieved, the ash activity is improved, comprehensive utilization of the ash can be achieved by 100%, discharging of solid waste is reduced, meanwhile, consumption of desulfurization calcium powder in a fluidized bed boiler is reduced, and the environmental-friendly benefit is enhanced.