Production method of food-grade potassium sulfite

The invention belongs to the field of food-grade potassium sulfite production, particularly relates to a production method of food-grade potassium sulfite, and aims at solving the problems that existing food-grade potassium sulfite is low in production efficiency and high in production cost. Proposed now is the following scheme, the method comprises the following steps: S1, pumping seawater by using water pumping equipment, firstly filtering the pumped seawater by using the water pumping equipment, introducing the filtered seawater into a glass exchange column filled with sodium-type natural zeolite, and adsorbing K ions in the seawater by using the sodium-type natural zeolite in the glass exchange column to obtain potassium-type natural zeolite; and S2, hoisting the glass exchange columnfilled with the saturated potassium type natural zeolite by using hoisting equipment, and placing a new glass exchange column filled with the sodium type natural zeolite at the position. The production method is easy to opera