Abstract: A life saving device includes a barrel, an air bottle having a mouth mounted on the barrel, an inflation nozzle having a first end connected to the mouth and a second end connected to a life saving equipment, a breaking mechanism operable to break the mouth, a stop bar movable to abut the breaking mechanism, a control handle pivotally mounted on the barrel and connected with the stop bar, an elastic member biased between the barrel and the control handle, and at least one water-soluble cord enclosing the air bottle and the control handle. Thus, the water-soluble cord is dissolved in the water quickly so that the life saving equipment can be inflated automatically without needing a manual operation, thereby facilitating the user employing the life saving equipment during an emergency.