Automatic inflation device for life jacket

The invention relates to the technical field of life jacket inflation, in particular to an automatic inflation device for a life jacket, which comprises an inflation ring bin, a plurality of groups of second inflation heads are detachably arranged above the inflation ring bin in a communicating manner, a shell, a compression mechanism and a separation mechanism are arranged on the inner side of the inflation ring bin, and a sealing cover is arranged at the upper end of the shell. The separation mechanism is arranged on the inner side of the shell and divides the shell into an upper space and a lower space, and the compression mechanism penetrates through the sealing cover and can press gas in the upper space into the lower space; according to the air inflation device, the air inflation ring bin and the multiple sets of second air inflation heads are arranged and can be matched with the first air inflation heads of the multiple life jackets at the same time, air can be inflated into the life jackets after each