The invention discloses a quick-frozen mango fruit product and a preparation method thereof. The preparation method comprises the following steps of (1) selecting raw materials: selecting 70%-80% ripened yellow-skin mangoes which are plump in fruits, thick in flesh quality, free from stains and scars, and free from insect damages; (2) performing washing: performing washing by clean water, removingbacteria and other impurities on outer skin of the selected mangoes, and performing airing; (3) performing bacterium removal: performing physical bacterium removal by high-pressure ion flow sterilization equipment, and performing airing; (4) performing skin removal and kernel separation: removing mango fruit tips (mango fruit tails) and mango fruit heads (mango fruit stems: the taste of the mangofruit stems is astringent, and the mango fruit stems are sensitive areas), performing skin removal under the low-temperature condition by mechanical equipment, and performing kernel separation underthe low-temperature condition by the mechanical equipment, so as to obtain chopped mango flesh; (5) performing pulping, performing homogenizing and performing deoxidizing: making the obtained choppedmango flesh into mango pulp by a pulping machine, performing homogenizing treatment under the low-temperature condition, performing deoxidizing treatment under the low-temperature condition, and performing standing; (6) performing flash freezing and quick freezing: performing flash freezing and quick freezing on the sterilized mango fruit product under minus 60-minus 80 DEG C by liquid nitrogen for shaping;, and (7) performing low-temperature storing: quickly transferring the quick-frozen mango fruit product to a cold storage storeroom of which the temperature is minus 25-minus 35 DEG C, so asto obtain the finished products. Through the adoption of the preparation method disclosed by the invention, the quick-frozen mango fruit product is mushy and soft in mouth feel, pure in flavor and bright yellow in color.