Drilling machine and drilling bit clamp thereof

The embodiment of the utility model discloses a drilling machine and a drilling bit clamp thereof. The drilling bit clamp comprises an adapter sleeve which can be sleeved on a main shaft of the drilling machine, a sliding sleeve which can axially slide relative to the main shaft of the drilling machine, and an elastic return part which is arranged between the adapter sleeve and the sliding sleeve, wherein the elastic return part is axially abutted against the adapter sleeve and the sliding sleeve. A through hole for accommodating a pin shaft is formed in the radial direction of the sliding sleeve, and the pin shaft can penetrate though a vertical hole of the drilling machine. Fastening holes through which the adapter sleeve is fixed on the main shaft via fastening bolts are formed in the radial direction of the adapter sleeve. By using the drilling bit clamp of the drilling machine, a user only needs one hand to rotate a feeding hand wheel to complete the whole drilling bit clamp dismounting process, therefor