The invention relates to the technical field of food processing, in particular to a passion fruit mooncake and a preparing method thereof. Crust is mainly prepared from raw materials including plain flour, barley flour, passion fruit juice, artichoke juice, soybean meal, sweet almond powder, inulin, gluconic acid-delta-lactone, sodium bicarbonate, grape seed oil, fenugreek oil, sweetening agent and the like. Stuffing is mainly prepared from raw materials including passion fruit pulp, winter melon pulp, yam puree, donkey-hide gelatin mash, lemon, orange, sassafras, cajeput, syrup, sesame oil, radix sophorae flavescentis oil, vegetarian meat powder, gluconic acid-delta-lactone, methyl maltol, sodium chloride, microorganism and the like. The passion fruit mooncake is prepared through the steps of preparing, forming, stepwise braking and the like of the crust and the stuffing. The mooncake has strong fruity flavor, is mellow in taste, agreeable in sweetness, soft and crispy, rich in nutrient and long in shelf life, has various healthcare functions of promoting intestinal tract movement, helping digestion, purging gut and removing toxin, allowing people to maintain beauty and keep young, replenishing blood and tonifying qi and the like, and is simple in preparing method and easy to produce.