The invention discloses a life jacket. The life jacket comprises a life jacket body, positioning modules arranged on shoulders of the life jacket body and an inner heating cover which is arranged on the inner side of the life jacket body. The positioning modules are arranged on the life jacket and can be tracked by a search-and-rescue team and locate the position of a person in distress in time, and search-and-rescue personnel can carry out rescue operation conveniently. In addition, in the using process, the inner heating cover can be started, the lowering speed of the body temperature can be effectively decelerated, and more time can be provided for rescue, so that the situation that the body temperature of the person in distress in water is quickly lowered, and the survival rate is decreased is avoided.