The invention discloses a camellia oleifera heat-clearing and detoxicating capsule and a preparation method thereof, and belongs to the field of a camellia oleifera flower deep processing product. Thecapsule comprises camellia oleifera flower leaves, radix salviae miltiorrhizae, fructus cannabis, radix saposhnikoviae, herba andrographitis, mint, dried orange peel, myrobalan, chrysanthemum flowers, loquat leaves, scutellaria baicalensis, corydalis tuber, semen oroxyli, ginger, houttuynia cordata, radix saposhnikoviae, daphne genkwa, polygonum cuspidatum, centipeda minima, Chinese angelica, astragalus membranaceus, white paeony root, radix sophorae subprostratae, prepared rehmannia root, radix angelicae, rheum officinale, walnut kernels and bezoar. The preparation method comprises the following steps: (1) preparing materials; (2) crushing and mixing the materials; (3) pelleting; and (4) filling and packing. The camellia oleifera heat-clearing and detoxicating capsule can reduce free radicals in organs and tissues, protect the organs and tissues from being injured and enhance the immunity of the organism, and has good health-care effect on human health.