Air-cooling heat dissipation device and power unit cabinet

The utility model relates to an air cooling heat dissipation device for a power unit cabinet. The number of fans can be flexibly adjusted according to the number of power units. The air cooling heat dissipation device comprises an installation plate assembly and a fan assembly, the installation plate assembly further comprises an installation plate and a positioning plate, the installation plate is rectangular, the positioning plate is strip-shaped and is arranged on the edge of one short side of the installation plate, and an air window is arranged on the installation plate; the fan assembly comprises a fan box, a fan and a fan support, the fan is fixed in the fan box through the fan support, an opening is formed in the top of the fan box, an air opening corresponding to the fan is formed in the bottom of the fan box, and the rotating axis of the fan penetrates through the air opening; the outer edge of the fan box abuts against the positioning plate, and the air outlet corresponds to the air window in posit