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Stony corals, the primary architects of coral reef ecosystems, are largely underrepresented in omics studies despite their importance. The presence of endosymbiotic Symbiodiniaceae algae complicates the extraction of pure coral DNA, posing a challenge for genomic research. Here, we devised a comprehensive methodological framework that incorporates various experimental treatments to achieve 99% purity in coral DNA extraction and a robust bioinformatics pipeline to guarantee the assembly of high-quality, contamination-free coral genomes. Validation of our framework using Acropora millepora samples demonstrated its efficacy and superiority in obtaining high-quality pure coral genomes using easily accessible adult colony. This integrated framework serves as a critical foundation for large-scale genome-enabled research on stony corals, providing insight into coral evolution and conservation.