In this paperthe recycling of waste cement is the research goal, a desulphurized gypsum-waste cement system was constructedand the effect of carbonization on the mechanical properties and apparent density of the desulphurized gypsum-waste cement system was evaluated. The compositionchemical structure and morphology changes of the recycled blocks were revealed by XRDFTIR and SEM. The results show that the carbonization of waste cement can proceed smoothly in the presence of gypsum. The carbonization process can effectively improve the compressive strength of desulphurized gypsum-waste cement samples. When the water-cement ratio is 0.4 and the waste cement content is 60% (mass fraction)the compressive strength of carbonized sample increases by 1083% compared with that of the uncarbonized sample. When the water-cement ratio is 0.8 and the waste cement content is 65% (mass fraction)the compressive strength of carbonized sample increases by 270.0% compared with that of the uncarbonized sample. The chemical structure and microstructure of carbonized products can be controlled by adjusting water-cement ratio and waste cement content. The carbonization process can promote the hydration of waste cementenhance the mechanical properties of the systemand reduce the apparent density of the block. The research results will provide a new idea and a reliable recycling scheme for the comprehensive utilization of waste cement and desulphurized gypsum.