The hazards of herbicides on human body are mainly manifested in acute poisoning, chronic hazards, carcinogenicity, teratogenicity, mutagenicity and so on. 1. Acute poisoning: accidental ingestion of herbicides will have a serious impact on the human body, resulting in acute poisoning, serious life-threatening. 2. Chronic hazards: Herbicides continue to accumulate in the human body, and although they will not cause obvious acute poisoning symptoms in a short period of time, they can produce chronic hazards, such as destroying the normal function of the nervous system, interfering with the balance of hormones in the body, affecting male fertility, and leading to immunodeficiency diseases. 3. Carcinogenic, teratogenic, mutagenic: The International Agency for Research on Cancer (IARC) has confirmed, based on animal experiments, that widely-used herbicides are obviously carcinogenic and can cause cancer and teratogenicity in humans. Therefore, the use of herbicides must be strictly in accordance with the instructions for use, good management, to avoid accidental ingestion.