Whether patients with renal failure can eat watermelon mainly depends on whether patients have complications such as edema, heart failure, hyperkalemia and so on. If patients do not have the above complications, they can eat watermelon in moderation; if they have the above complications, they are not recommended to eat watermelon. Patients with renal failure have impaired excretion of metabolic wastes and water, which can easily lead to sodium and water retention. If patients do not have edema, heart failure, hyperkalemia and other complications, they can eat in moderation. If the patient has the above complications, because watermelon has more water, the consumption of watermelon may lead to the patient’s water load, thus aggravating the condition, and consuming too much watermelon may aggravate hyperkalemia, which may lead to cardiac arrest in severe cases, etc., and at this time, it is not recommended that the patient consume it. It is recommended to consult nephrologist and nutritionist for the diet of patients with renal failure, and eat reasonably under the guidance of doctors.