The present invention relates to a method for preparing bay salt capable of removing harmful materials and increasing healthful ingredients, by burning the bay salt. The preparation method according to the present invention comprises the following steps: (a) filling a red clay pottery with bay sa (b) heating a red clay kiln to a temperature of 1000-1400C by using hardwood charcoal; (c) placing the red clay pottery containing the bay salt on the heated red clay kiln; (d) after placing the red clay pottery on the kiln, oxidizing Na and Cl ingredients contained in the bay salt and then heating the red clay pottery for 7-10 minutes at the same temperature to thereby burn the bay salt to supplement with salt of inorganic components; and (e) after step (d), taking out the red clay pottery containing the burned bay salt from the red clay kiln. Accordingly, the bay salt prepared through heating at 1000-1400C for 7-10 minutes using hardwood charcoal reduces Na and Cl contents by 10-20% and contains large amounts of inorganic components as compared with the existing burned bay salt, thereby exhibiting relatively superior anti-cancer and anti-oxidizing effects. [Reference numerals] (S110) Filling a pottery with bay sa (S120) Heating a red clay kiln to a predetermined temperature by using hardwood charcoal; (S130) Placing the pottery containing the bay salt on the heated red clay kiln; (S140) Heating the red clay pottery for 7-10 minutes to cook the bay sa (S150) Taking out the red clay pottery containing the cooked bay salt from the red clay kiln
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