The invention discloses a strain of yeast with strong capacities of tolerating, enriching and converting organic selenium, which is named Candida utilis CUM and has been preserved in China center for type culturecollection on April 19, 2010 with the preservation number of CCTCC M 2010090. The Candida utilis CUM has the bacterial characteristics that: cells are round, oval or sausage-shaped, and performs vegetative propagation in a mode of multi-edge germination to form pseudohypha; wort solid culture is carried out, and the bacterial colony is milk white, has smooth and moist surface, gloss or no gloss, and neat or hypha-shaped edges; the Candida utilis CUM is chemoheterotrophic, and can ferment glucose, cane sugar and raffinose; and the Candida utilis CUM is facultatively anaerobic, performs aerobic respiration under the aerobic conditions and performs alcoholic fermentation under the anaerobic conditions. The Candida utilis has strong selenium enriching capacity and good stability, can be used for producing selenious yeast, and is a strain with high research and development value.