Universal blade groove rotatable drill bit cutter body with plurality of inner cooling holes

The utility model discloses a universal blade groove rotatable drill bit cutter body with a plurality of inner cooling holes. The universal blade groove rotatable drill bit cutter body comprises a cutter body, wherein a first spiral chip removing groove and a second spiral chip removing groove along the central axis are formed in the cutter body; the front end of the first spiral chip removing groove is provided with a central blade mounting groove formed by three positioning side faces and used for carrying out side face positioning on a central blade; the front end of the second spiral chip removing groove is provided with a peripheral blade mounting groove formed by two positioning side faces and used for carrying out side face positioning on a periphery blade; each positioning side face is composed of a curved part and a plane part; the projection of each positioning side face on the horizontal plane is in a bent finger shape; the three positioning side faces of the central blade mounting groove and the two positioning side faces of the peripheral blade are connected end to end respectively. According to the universal blade groove rotatable drill bit cutter body, a specific abnormal drilling blade can be mounted and a standard S-shaped drilling blade with the same IC value can be mounted; meanwhile, the plurality of inner cooling holes are formed so that the drill bit cooling effect can be improved and the chip removing performance of a rotatable drill body is improved.