The invention discloses a highly stable position-limiting mechanism for CNC machine tool product delivery, which includes a clamping mechanism, a support mechanism and an adjustment mechanism. The upper end surface of the adjustment mechanism is evenly and equidistantly threaded and slidingly connected with four sets of position-limiting mechanisms. A clamping mechanism, and the clamping mechanism includes a clamping head, a chute, a limit slot, a connecting bolt, a threaded hole and a limit block, and the outer end surface of the clamping head is symmetrically provided with a chute close to the middle. In the present invention, by setting the adjusting mechanism, the connecting motor can drive the connecting seat to rotate during the movement, and when the connecting seat rotates, the tooth groove can drive the four sets of connecting gears to rotate together, which is convenient for subsequent power supply for the clamping head , At the same time, the four sets of screw rods are threaded sliding connection with the bottom of the clamping head, and the clamping method of the threaded sliding connection can effectively improve the stability of the clamping.