Clinically, there is no such statement as “the best supplement for bladder cancer”. For patients diagnosed with bladder cancer, treatment should be mainly based on surgery, supplemented by postoperative adjuvant therapy and radiotherapy. Bladder cancer is the fourth most common malignant tumor among men and the eighth most common malignant tumor among women, with clinical manifestations of intermittent painless hematuria, urinary tract irritation and urinary difficulty, and in the late stage, there may be infiltration around the pelvic floor and distant metastasis, which will lead to corresponding clinical symptoms. For malignant tumors, it is usually recommended to eat more light and easy to digest food rich in high quality protein and vitamins, less spicy and stimulating food, in addition, bladder cancer patients need to drink more water, do not hold urine. Foods rich in high quality protein and vitamins, such as lean meat, egg products, carrots, green leafy vegetables and so on. They can help bladder cancer patients recover their body and increase the body’s resistance to disease. Fruits can replenish a lot of water and vitamins, which can ensure relatively smooth bowel movement, and it is suggested that you can eat apples, pears, grapes, pineapples as well as watermelons. Risk factors for bladder cancer include working in textile, dye manufacturing, rubber chemicals, pharmaceutical and pesticide production, paints, leather, abuse of painkillers containing finasteride (for more than 10 years), long term consumption of monolithic water and chlorinated water, coffee, selecting sweeteners, and hair coloring. It is necessary to avoid the above factors as much as possible. Diet is not a means of treatment, it is recommended to go to a regular hospital for a comprehensive assessment of the condition, follow the doctor’s instructions to cooperate with the treatment, control the progression of the disease, prolong the survival period, so as to avoid delaying the condition.