Abstract: Provided is an inflatable child safety seat. In one embodiment the child safety seat is filled with inflatable foam and includes a seat, a backrest integrally formed with the seat and having a through hole, a safety belt passed the through hole to dispose on the seat, two arm pads, two side protections provided at both sides of the backrest and integrally formed with the arm pads, an enclosure for enclosing the seat, the backrest, the arm pads, and the side protections, and a valve provided on an underside of the seat. Opening the valve to exit air in the enclosure will enable a collapsing of the enclosure. Unfolding and pumping air into the child safety seat via the valve will inflate the child safety seat.