Vegetable juice does not fight cancer. Vegetable juice is rich in water-soluble vitamins and minerals, such as potassium, magnesium, calcium, iron and other elements, drinking vegetable juice can also supplement flavonoids, polyphenols and organic acids and other nutrients. However, as a kind of food, vegetable juice can only supplement the nutrients needed by the body, and does not have anti-cancer effect. Cancer patients can drink vegetable juice appropriately to replenish nutrients, and at the same time need to actively cooperate with doctors to carry out surgery, radiotherapy and other treatments in order to slow down the progress of the disease and prolong the survival period. They should not indiscriminately use prescriptions or self-medication to avoid adverse effects. It is recommended that cancer patients actively consult doctors and standardize treatment to avoid delays.