Paraquat is a very common herbicide in agricultural production. Paraquat is very toxic to both humans and animals and can cause acute poisoning if taken. Paraquat can be absorbed through the skin, digestive tract and respiratory tract. Paraquat poisoning can cause damage to multiple organs, such as esophageal and gastric erosion and ulcers if taken orally, resulting in nausea, vomiting, abdominal pain and diarrhea, and in severe cases, perforation of the digestive tract may occur. Paraquat can also cause kidney damage, hematuria and proteinuria, leading to acute renal failure. The most serious harm of paraquat is that it can produce lung damage, patients will have chest tightness, shortness of breath, difficulty in breathing, and in serious cases, pulmonary edema and pulmonary hemorrhage will occur, and many patients will die of respiratory failure. Therefore, patients with paraquat poisoning should go to hospital for examination and treatment in time.