The precautions before hepatitis B vaccination include paying attention to the time of vaccination, cleaning the body and checking before vaccination. 1. Pay attention to the vaccination time: after the first vaccination of hepatitis B, the second vaccination should be given one month after the first vaccination, and the third vaccination should be given five months after the first vaccination, so you should pay attention to the vaccination time before the second and third vaccination. 2. Clean body: the day before hepatitis B vaccination, you should clean your body and wear clean clothes, if you don’t pay attention to personal hygiene, bacteria may be infected through the needle hole of hepatitis B vaccine, which is not good for the health of the organism. 3. Pre-vaccination examination: before injecting hepatitis B vaccine, we should carry out the examination of hepatitis B pentameter, and inject hepatitis B vaccine for those who are not infected with hepatitis B virus and whose surface antibody against hepatitis B is negative. Therefore, before hepatitis B vaccination, we must cooperate with professional personnel to conduct examination to ensure the safety of hepatitis B vaccination.