The invention discloses a vitamin D2-rich natural bacterium powder tablet candy and a preparation method thereof. The candy is prepared from the following raw materials by mass percent: 10 to 20% of natural bacterium powder, 5 to 20% of maltodextrin, 5 to 20% of mannitol, 5 to 20% of sorbitol, 5 to 10% of natural menthol, 5 to 10% of croscarmellose sodium, 1 to 3% of magnesium stearate, 5 to 10% of corn starch, 5 to 10% of milk powder, and 0 to 3% of essence. The natural bacterium powder tablet candy processed by taking ultraviolet-irradiated natural bacterium powder and maltodextrin as the raw materials, and adding the mannitol, sorbitol, natural menthol, magnesium stearate, croscarmellose sodium, corn starch, milk powder, essence and the like has the advantages of tasting good, facilitating eating, enriching in vitamin D2, enhancing immunity, promoting calcium absorption, and preventing osteoporosis.