The role of low-sodium salt is mainly to control the sodium-potassium balance and reduce the incidence of cardiovascular diseases. Compared with common salt, which also contains iodized salt, low-sodium salt adds about 30% potassium chloride and a portion of magnesium sulfate compared with common salt. Most of the cardiovascular diseases are related to the high sodium environment in the body, high sodium will increase the occurrence and amplitude of myocardial action potential, thus inducing heart disease, so the low sodium diet can reduce the probability of cardiovascular disease, while the added potassium salt can balance the body’s ratio of sodium and potassium. However, it should be noted that because of the addition of some potassium chloride, patients with high blood potassium and renal dysfunction should be cautious in using it. Consumption of low-sodium salt should consult a specialized doctor, who will decide on an individual basis and follow medical advice.