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A new species of the genus Occidozyga is reported from Southern Guangxi, China, based on morphological characters and molecular analyses. Morphological data revealed that the new species, Occidozyga shiwandashanensis sp. nov., differs from its congeners by a combination of the following characters: (1) medium body size (SVL 25.2−33.8 mm in males, 34.9−38.9 mm in females); (2) pale brown dorsum with irregular pale dark spots, especially on head; (3) creamy white ventral surface with brown spots on lateral margin and throat; (4) tongue fleshy, rounded, without notch, (5) tympanum hidden; (6) finger webbing absent and toe webbing full, but fourth toe not webbed to discs; (7) tips of fingers pointed, tips of toes rounded, slightly expanded into disc. The new species occurs on Mt. Shiwandashan and inhabits montane evergreen forests at 500−600 m above sea level.