The invention discloses a skin whitening composition. The skin whitening composition contains tranexamic acid, ascorbic acid ethyl ether, vitamin B3, N-(omega-undecylene acyl) phenylalanine, chamomile extract, dunaliella tertiolecta extract (IBR-CLC 0402), methylene bis-benzotriazolyl tetramethyl butyl phenol, coenzyme Q10, purslane extract, alpha-red myrrh alcohol, beta glucan, clove oil, azone, 1,3-butanediol solvent as well as 1,2-octylene glycol and ethylhexylglycerin antiseptics. The active ingredients in the skin whitening composition can inhibit activity of tyrosinase, reduce formed melanin, inhibit migration of melanin globules, block information transmission between keratinocytes and melanocytes, promote falling off of cuticle, absorb ultraviolet rays, eliminate free radicals and resist inflammation. According to the skin whitening composition, each component is significant in synergic whitening effect, and the skin whitening composition is safe and stable and can be applied to skin whitening cosmetics.