It is primarily used in the inorganic industry as a basic raw material for the manufacture of various potassium salts or alkalis, such as potassium sulfate and potassium alum.

In the pharmaceutical industry, it is used as a diuretic and a drug for treating potassium deficiency.

In the dye industry, it is used to produce G salts and reactive dyes.

In agriculture, it is a fast-acting potash fertilizer. Directly applied to farmland, it can increase the moisture content of the subsoil and provide drought resistance.

However, it should not be applied to saline-alkali land or crops such as tobacco, sweet potatoes, and sugar beets. Potassium chloride tastes similar to sodium chloride (bitter) and is also used as an additive in low-sodium salts or mineral water.

It is also used in the manufacture of flame retardants for gun and cannon muzzles, as a heat-treating agent for steel, and in photography.

It also has applications in medicine, science, and food processing. Potassium chloride can also be used as a partial salt substitute to reduce the risk of high blood pressure.