When bitten by a water snake, it is impossible to determine whether it is poisonous or not by oneself, and needs to be determined through relevant examinations. Whether the bite of water snake is poisonous or not cannot be assessed according to the symptoms, it is necessary to consult a doctor in time and analyze the situation through relevant examinations under the guidance of a professional physician. In order to determine whether there is poisoning after being bitten by a water snake, it is necessary to do laboratory tests first, such as routine blood tests, which can be diagnosed and analyzed by peripheral blood cell counts and hemoglobin concentration, and then carry out special test tests, such as the latex transplantation test, which mainly detects antigenic reactions with snake venom. After being bitten by a water snake, in order to be safe, it is recommended to seek medical treatment in time and analyze whether there is any poisoning through relevant examinations. Once poisoning is detected, or there are other adverse reactions, timely treatment is needed to avoid threatening life and health.