The invention relates to a high-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method and belongs to the technical field of continuous casting sheet billets. The high-carbon-equivalent continuous casting sheet billet stacking and slow-cooling method comprises the specific steps and parameters that the surface temperature after high-carbon-equivalent sheet billets are discharged from a production line is 850-900 DEG C; the stack bottom, top and periphery of a high-carbon-equivalent sheet billet stack are fenced by hot billets, and the surface temperature of the hot billets on the stack bottom, top and periphery is 300-600 DEG C; the distance between a peripheral hot billet stack and the high-carbon-equivalent sheet billet stack is controlled to 1.5-2.0 m; the stacking height of the high-carbon-equivalent sheet billets is smaller than or equal to 2 m, the sum of the stacking heights of the high-carbon-equivalent sheet billets, the stack bottom hot billets and the stack top hot billets is smaller than or equal to 2.5 m, and the height of the peripheral hot billet stack is not smaller than the sum of the sum of the stacking heights of the high-carbon-equivalent sheet billets, the stack bottom hot billets and the stack top hot billets; and the stacking and slow-cooling time is 120-240 hours. After the slow-cooling time reaches 96 hours, the surface temperatures of the high-carbon-equivalent sheet billets and the surface temperature of the peripheral hot billets are measured and are below 300 DEG C for 48 hours continuously, and then unstacking is conducted. The method has the advantages that low-cost production is achieved, the sheet billet breaking risk is reduced, and the development requirements of high-carbon-equivalent sheet billet products are met.