The invention belongs to the technical field of AP1000 nuclear power and particularly relates to an air flow guiding apparatus. The invention aims to ensure the stability of cooling operation to a containment by a containment cooling system in a nuclear power station. The air flow guiding apparatus is in an annular plate-like structure and is located between a barrier shield and the containment so as to divide the space therebetween into a space between the barrier shield and the air flow guiding apparatus and a space between the air flow guiding apparatus and the containment, bottoms of the two spaces are communicated with each other and tops are communicated with external atmosphere. By means of the air flow guiding apparatus, a boundary for guiding air flow is established between the barrier shield and the containment, so that cold air from the external atmosphere is introduced so as to remove heat, dissipated by the containment, due to flowing of air, thus achieving passive cooling to the containment. The air flow guiding apparatus not only avoids dependency on external power and saves resources, and improves reliability of cooling the containment.