The invention discloses an adjustable drill bit breaker, and belongs to the field of well drilling equipment. The breaker comprises a square base and a handle arranged on the square base, and the square base is provided with a U-shaped opening groove and a movable front baffle used for opening or plugging an opening of the U-shaped opening groove; the breaker further comprises two side baffles anda rear baffle, the two side baffles are fixed to two side plates of the U-shaped opening groove in a mode that the stretch-in length of the side baffles is adjustable, and the side baffles are used for adjusting the width of the U-shaped opening groove; and the rear baffle is fixed to an arc-shaped top plate of the U-shaped opening groove in a mode that the stretch-in length of the rear baffle isadjustable, and the rear baffle is used for adjusting the length of the U-shaped opening groove. The adjustable drill bit breaker can be used for bits with various specifications, and the embracing force is high.