Top drive motor main shaft upper end sealing structure and top drive drilling machine

The invention provides a top drive motor main shaft upper end sealing structure and a top drive drilling machine, and belongs to the field of drilling equipment. The top drive motor main shaft upper end sealing structure comprises a sealing shell, a main shaft upper end, a main sealing sleeve and an airflow collecting device. The main shaft upper end penetrates through the sealing shell. The mainsealing sleeve sleeves the sealing shell and sleeves the outside of the main shaft upper end, an air storage gap is arranged between an inner wall and an outer wall of the main shaft upper end, and anupper end and a lower end of the main sealing sleeve are respectively sealed with the main shaft upper end so that two ends of the air storage gap are sealed to form a sealing chamber. The airflow collecting device is communicated with the sealing chamber and used for being arranged in an air duct to collect air flow and enabling the collected air flow to flow into the sealing chamber, and the top drive drilling machine c