Plus salt water lamp, as a new energy outdoor emergency light, has a beautiful appearance and uses environmentally friendly liquid materials; it is easy to obtain materials (salt water, sea water, cola, soda water and other electrolyte water, and even urine can be used to light the lamp); it is safe and non-electric, avoiding the risk of fire; it can charge mobile phones and other communication equipment in an emergency, and is a must-have item for emergencies, camping, night fishing, and hiking.