The utility model relates to a life jacket lamp, which includes an upper casing and a lower casing which are vertically and hermetically matched, as well as lithium batteries which are arranged in the upper and the lower casings. The life jacket lamp is characterized in that an ultra-bright LED lamp bead is arranged on the front end surface of the upper casing; a hanging buckle or a fixing plate used for being fixedly connected onto the life jacket is arranged at one end on the rear end surface of the lower casing, and a rotary switch and a water-contact switch which are used for turning on/off the ultra-bright LED lamp bead are arranged at the other end on the rear end surface of the lower casing. The life jacket lamp is a life saving device equipped on the life jacket, is suitable for the people overboard at night on the sea emitting light signals to rescue personnel, and further realizes the purpose of life saving; the light switch is a two-stage switch, the first stage is the rotary switch, and the second stage is the water-contact switch; the lamp can be turned on through rotating the rotary switch to the 'ON' direction in place at first, and then enabling the water-contact switch to be contacted with water; and the lamp can be turned off through enabling the lamp to be away from the water surface or rotating the rotary switch to the 'OFF' direction in place.