Multi-angle drilling dustproof device

The utility model relates to a multi-angle drilling dustproof device which comprises an outer shell with an opening in the left end, a through hole is formed in the right end face of the outer shell, a ball block is arranged in the through hole, the ball block can rotate freely and can be fixed, a straight pipe is arranged on the ball block, an air inlet hole is formed in the right end of the straight pipe, and an annular plate is coaxially fixed to the right end of the straight pipe. Four transverse rods are evenly distributed on the right end face of the annular plate along the circumference, the rod diameters of the transverse rods are gradually increased from left to right, a circular ring is arranged on the portion, located on the outer side of all the transverse rods, of the right side of the annular plate, and the circular ring can move left and right in the mode of being attached to the transverse rods. The opening of the air outlet is larger than that of the air inlet; the air outlet is connected wit