1. It is used as analytical reagent and oxidant, and also for the synthesis of potassium salt and the preparation of explosives.

2. In the food industry, it can be used as hair color agent, color protecting agent, anti microbial agent, preservative, for example, it can be used for pickling meat, and it can play an antiseptic role in luncheon meat.

3. It is the raw material for making black powder, such as mine powder, fuse, firecracker, etc. Also used in fireworks to produce purple sparks. Mechanical heat treatment is used as salt bath for quenching. The ceramic industry is used in the manufacture of glaze color medicine. Used as glass clarifier. It is used to manufacture automobile lamp glass shell, optical glass kinescope glass shell, etc. The pharmaceutical industry is used to produce penicillin potassium salt and rifampicin. Used for making cigarette paper. Used as a catalyst. Beneficiation agent. Used as compound fertilizer for crops and flowers.

4. Potassium nitrate is also a permitted hair colorant in China. It can protect color and inhibit bacteria by reducing to potassium nitrite in meat products. According to China's regulations, it can be used in meat products with a maximum usage of 0.5g/kg and a residue of no more than 0.03g/kg.

5. Used for making fireworks, matches, ceramic glaze medicine, fertilizer, etc.

6. Industrial potassium nitrate is also widely used in the production process of reinforced glass.