A quick inflation system for air mattress includes first and second air supply sources connected to air delivery lines and quick air charging lines, respectively. The air delivery lines are further connected to first inflatable portions of an air mattress and respectively have a connecting line led to air input lines connected to second inflatable portions of the air mattress. The quick air charging lines are further connected to the air delivery lines. With these arrangements, once the first and second air supply sources start supplying air, the first and second inflatable portions of the air mattress can quickly change from a non-expanded state into an expanded state. Thereafter, the first air supply source is fluidly connected to different ones of the air delivery lines in a specific sequence so that there are always some of the first inflatable portions that continuously change between the non-expanded and the expanded state.
