The invention relates to lactobacillus helveticus LH43, and more specifically relates to a method for preparing a lactobacillus beverage by utilizing the lactobacillus helveticus LH43. The method comprises the following steps: (1) powder dissolution; (2) first sterilization; (3) cooling; (4) inoculation: inoculating lactobacillus helveticus LH43 freeze-dried powder in milk processed in the step (3) to carry out fermentation; (5) heat-preservation enzymolysis: carrying out enzymolysis on the fermented milk at 35-37 DEG C for 3-5h to form fermentation liquor; (6) blending: weighing the substances according to mass percent and mixing uniformly to form the lactobacillus beverage; (7) second sterilization; and (8) filling. As the exclusive lactobacillus bulgaricus LH43 is fermented to prepare the lactobacillus beverage without adding protease and only a heat-preservation enzymolysis process is added in the traditional lactobacillus preparation process, so that good enzymolysis effect can be achieved to generate a large amount of active peptide, and the fermentation flavor is more unique and strong at the same time.