A milk beer is proportionally prepared from fresh milk whey, composite milk wine yeast, malt, beer hop, beer yeast, purified water and other auxiliaries through sterilizing milk, cooling, extracting casein, sterilizing whey liquid, cooling, fermenting, adding composite milk wine yeast, fermenting, adding malt and hop, saccharifying, fermenting, adding beer yeast and fermenting. Its advantages are refreshing milk smell, and rich nutrients including ammino acids, vitamines, carotene, etc.