The utility model provides a quick inflation system which comprises an inflation device, an air inlet device and an air source, wherein the inflation device comprises a bottle valve assembly; the bottle valve assembly consists of a bottle body and a relief valve; an open end of the bottle body is connected with the relief valve by a hose; the relief valve is provided with two openings; the air inlet device comprises a float, mounting seats and air inlet valves; the float consists of an upper float and a lower float; the mounting seats are fixedly mounted on the upper float and the lower float; each mounting seat is provided with one air inlet valve correspondingly; one end of each of the two air inlet valves is connected with each of the two openings of the relief valve by an air inlet hose; the other end of each of the two air inlet valves leads into each of the upper float and the lower float; the bottle valve assembly is communicated with the upper float and the lower float by the relief valve and the corresponding air inlet valves respectively; and the air source is placed in the bottle body of the bottle valve assembly. The quick inflation system has the benefits that the normal-temperature working capacity and the low-temperature working capacity of a lifeboat can be improved; the inflation forming time of the lifeboat can be shortened; the escape and self-rescue time can be increased; and the quick inflation system can be applied to various twin-float lifeboats, and is wide in application prospect.