The invention relates to a sea-tangle soda biscuit and a production method thereof and solves the problems of elevated blood pressure, aggravated edema and easiness weight gaining of the traditional soda biscuit. The sea-tangle soda biscuit comprises fishy smell eliminated sea-tangle flour, wheat flour, pat flour, white granulated sugar, milk powder, bicarb, ammonium bicarbonate and active dry yeast. The production method of sea-tangle soda biscuit comprises the following processes of preparation of fishy smell eliminated sea-tangle flour, raw materials processing, a first process of making paste, a first fermentation, a second process of making paste, a second fermentation, a rolling process, a forming process, a baking process, a cooling process and a packaging process and then the sea-tangle soda biscuit is obtained. Sea-tangle flour and oat flour are added to the raw materials to improve the nutritive value of soda biscuit and the prepared soda biscuit becomes a lodine supplementation, blood fat reducing, blood pressure reducing, fat absorbing prevention and diabetic prevention health food. The production method of the sea-tangle biscuit has the advantages of being simple in production technology, reasonable in working procedure and short in production cycle.