The invention discloses a preparation method of instant low-salt kimchi powder. The instant low-salt kimchi powder is prepared by the process of puffing low-salt kimchi flour, coarse food grain and starch, and adding soft sugar. The preparation method has the advantages of being simple in technology, convenient to operate, low in production cost and the like, is applicable to industrial production, abundant in nutrition, and long in guarantee period; the low-salt kimchi has market competitiveness as one vegetable no matter in nutritive value or convenience of the source in competition for the market.