The invention relates to a preparation method of a flower-flavored hard bean curd. The preparation method of the flower-flavored hard bean curd comprises the steps of adopting soy isolate protein, vegetable oil, water, white granulated sugar and rose water as main ingredients; carrying out brine treatment; stirring for pulping; moulding for sizing; fermenting at constant temperature; stripping and slicing for forming; boiling with baked wheaten paste and air drying; seasoning; baking; sterilizing and packaging to form the flower-flavored hard bean curd. The prepared flower-flavored hard bean curd is rich in protein and elastic in taste, and has a special rose flavor; isoflavone in the soy isolate protein can be beneficial to promoting lipolysis and reducing cholesterol, and promoting bone calcification at the same time, has the ability of inhibiting tumor cells proliferation, high antioxidant activity, and special functions of protecting vascular endothelial cells and the like, and is good for preventing cardiovascular disease and protecting heart; the rose has the efficacies on regulating vital energy and promoting blood flow, discharging liver and relieving depression, calming, soothing and resisting depression.