The invention belongs to the technical field of Chinese traditional medicine application, and specifically relates to application of chrysin to preparation of drugs for treating obesity-related metabolically triggered inflammations. According to the invention, the chrysin promotes the replacement activation of IL-4 activated mouse macrophages, promotes the release of anti-inflammatory cytokines IL-10, and promotes the rise of enzyme activity of typical labeled molecule arginine for the replacement activation of the macrophages, the up-regulation of surface molecules MGL1/2 and the up-regulation of classical molecules CD206, Ym1 and Fizz. Especially, in fat mice C57/B6 induced by high-fat feeding, the chrysin is capable of inhibiting the release of proinflammatory cytokines TNF-alpha, AST (Aspartate Transaminase) and ALT (Alanine Transferase) in blood serum, increasing the release of the anti-inflammatory cytokines IL-10, alleviating the lesion of liver and adipose tissues, inhibiting the phagocytic function of the peritoneal macrophages, the antigen presentation ability and the release ability of NO, and lowering the expression of the typically activated surface molecules CCR7 and CD80 of the macrophages. According to the invention, a new drug for treating the obesity-related metabolically triggered inflammations is developed.