The invention discloses high-calcium flour and a preparation method thereof. The high-calcium flour is prepared from the following materials of flour, yellow bean powder, dried small shrimps, milk, sesame seeds, cucumber seed powder, auricularia auricular, black bean peel dried powder, passiflora edulis, straw mushroom, vegetable marrow, sargassum fusiform, physalis alkekengi, pimiento, loquat flowers, haricot bean powder, sweet fermented flour paste, kiwifruits, wolfberry, fleece-flower root, cistanche salsa and the like. The high-calcium flour has the beneficial effects of rich nutrition due to the addition of the dried small shrimps, the milk, the sesame seeds, the cucumber seed powder and the like which are natural food containing high calcium, and capacity of assisting the absorption on calcium after long time use, thus being beneficial to the body health.