This research was conducted based on the mix ratio of ordinary concrete with compressive strength of C25, with the aim to use scallop shells to partly replace coarse and fine aggregates in concrete. Experiments were conducted on the mix ratio of scallop shell concrete, and the working performance and basic mechanical properties of coarse and fine scallop shells instead of natural aggregate concrete was compared. According to the reef plan of Shandong Province from 2016 to 2020, the carbon sequestration potential of the natural aggregate in the artificial reef concrete replaced by the scallop shells and the accumulation area of the cleanable waste scallop shells could be estimated. The results showed that as the proportion of scallop shells replacing natural aggregate increases, the collapse of concrete tends to decrease, and the slump of natural coarse aggregate concrete replaced by coarse scallop shells is larger than that of natural fine aggregate concrete replaced by fine scallop shells. When scallop shells replaced natural stone in concrete, the compressive performance of scallop shell concrete was similar to that of the base concrete. The optimum replacement rate of scallop shells as coarse aggregate was 40%, and the 28-day compressive strength of scallop shell concrete was 7.3% higher than that of the reference concrete. When the natural fine aggregate in concrete was replaced by scallop shells, the compressive performance of concrete was greatly improved relative to that of the reference concrete. The best replacement rate was 60%, and the 28-day compressive strength of scallop shell concrete was 33.5% higher than that of the reference concrete. Estimation replacement rate of fine aggregate with scallop shells for concrete was 50%~70%. For example, 20.43 million empty artificial reefs planned for 2016~2020 in Shandong Province are all made of this kind of concrete, reef materials can achieve carbon sequestration of 275.4~ 385.6 thousand tons and reduce the land accumulation area of abandoned shells by 5.89~8.24 square kilometers, which has high ecological value.