A powerful cooling heat dissipating unit of a direct air-cooled condenser comprising a cooling stave which is in a shape of a rotary body having a longitudinal axis, wherein the powerful cooling heat dissipating unit of the direct air-cooled condenser further comprises an air supply device and a diversion device, the diversion device is located in the cooling stave, and the air supply device comprises an air supply passage unit, an air supply ring and an air collection cavity, wherein the air supply ring is located at a lower part of the cooling stave, the air supply ring is an annular body with a cavity, and a ring-shaped slit air outlet is provided at a lower part of the air supply ring;
- the air collection cavity is located at the lower part of the air supply ring, and the air collection cavity is in a shape of a basin, an upper part of the air collection cavity communicates with the air supply ring;
- a partition plate is disposed in the air supply passage unit;
- and the partition plate divides the air supply passage unit into upper and lower air passages, the upper air passage communicates with the cavity of the air supply ring, and the lower air passage communicates with the air collection cavity.