The invention discloses a combined cutting tool for taking inner bamboo joints and tabasheer out of an intact bamboo tube. When the combined cutting tool rotates and moves in axial direction, three tabasheer cutting blades 5 synchronously open and cling to the inner wall of the bamboo tube under action of centrifugal force, plural rear cutter teeth 14 on the external curved surface of the tabasheer cutting blades 5 take the tabasheer out, at the same time, the inner bamboo joints are taken out by a small wimble 1, a large wimble 2, an end face tooth 11 on the front end face of the tabasheer cutting blades 5 and the plural front cutter teeth 12 on the external curved surface thereof; a section of depth limiting face 13 without cutter teeth is arranged in the middle of the external curved surface of the tabasheer cutting blades 5 and is used for limiting the depth of tabasheer cutting; each tabasheer cutting blade is provided with a synchronizing pin 3; the synchronizing pin 3 can slidein the radial groove of a synchronizing grooved pulley 4, thus ensuring that the three tabasheer cutting blades 5 can synchronously open under action of centrifugal force and can synchronously retractunder action of a resetting spring 8.