The invention provides a formula of a sea tangle crisp, and preparation method thereof. The sea tangle crisp is prepared from a main raw material of sea tangle and auxiliary materials including glutinous rice, white granulated sugar, sesame, cyclodextrin, salt, garlic, and ginger. The preparation method comprises the steps of blanching the sea tangle, cooling, adding sea salt for dewatering, cutting into blocks, oven-drying, frying, mixing the glutinous rice, the white granulated sugar, the sesame, the cyclodextrin, the salt, the garlic, and the ginger to obtain seasoning, and rolling the fried sea tangle with the seasoning to obtain crisp sea tangle. The inventive sea tangle crisp with the sea tangle as the main material has the advantages of good palatability, abundant nutrition, good taste, convenient consumption, simple process, good health promotion effect, low content of fat and harmful substances, and applicability for large-scale production.