The present invention relates to a cutting apparatus for a joint cutting system using a robot, and more particularly, to a cutting apparatus capable of stably supporting a shaft of a cutter to ensure the stability of a procedure, The present invention relates to a cutting apparatus for a joint cutting system using a robot that can increase the protrusion length and can overcome the limitations of an operation position and can perform a quick and accurate operation. A cutting apparatus for a joint cutting system using a robot includes a cutter having a cutting head formed at an end of a shaft, And a sleeve to which the shaft is inserted and connected to the robot arm portion, wherein the sleeve has a sleeve connection portion formed with a through hole therein and connected to the robot arm portion, and a sleeve projection portion integrally extending to the sleeve connection portion A formed sleeve body； A first support bearing inserted in a through hole portion of the sleeve connection portion and supporting an inner portion of the shaft； A first bearing support member coupled to the through hole and having a shaft insertion hole into which the first support bearing is inserted； A second support bearing inserted in the through hole portion of the sleeve projection and supporting an outer portion of the shaft； And a second bearing support member coupled to the sleeve projection for supporting and securing the second support bearing. According to this, since the inner portion of the shaft is supported by the first support bearing and the outer portion of the shaft is supported by the second support bearing, even if the cutter rotates at a high speed, warping and vibration are not generated, The durability is improved and the stability of the procedure can be secured. Also, even if the shaft rotates at a high speed, frictional heat is not generated, so that damage to the human body tissue can be prevented, and generation of metal foreign substances due to friction can
