Cap screwing head structure

The utility model discloses a cap screwing head structure which comprises a rotating base, a telescopic air rod, an elastic guide rod and a cap screwing head. The telescopic air rod can rotate along with the rotating base and can stretch out and draw back up and down relative to the rotating base. The elastic guide rod guides stretching out and drawing back of the telescopic air rod. The cap screwing head is installed at the tail end of the telescopic air rod. The inner ring diameter of the stainless steel bearing, the top diameter of the lower sliding sleeve and the bottom diameter of the lower sliding sleeve are widened, so that the first wear-resistant sleeve, the second wear-resistant sleeve and the third wear-resistant sleeve can be accommodated respectively; the rotary friction loss between the upper sliding sleeve and the inner ring of the stainless steel bearing and the sliding friction loss between the elastic small shaft and the lower sliding sleeve can be reduced, and the wear resistance between th