The invention relates to a feeding mechanism of a yarn switcher. The feeding mechanism of the yarn switcher comprises a yarn clamping and shearing device, a separating plate, a sliding plate and a connecting plate, wherein the sliding plate is mounted on the main yarn shearing blade of the yarn clamping and shearing device and provided with a connecting plate vertical sliding long hole and a rivet, and the lower end of the sliding plate is provided with a yarn pressing head; the main yarn shearing blade is provided with a rivet vertical sliding long hole; the separating plate is provided witha rivet inclined sliding long hole; one end of the rivet, which is opposite to the main yarn shearing blade, extends into the rivet yield vertical sliding long hole, and the other end of the rivet extends into the rivet inclined sliding long hole; during linear movement, the main yarn shearing blade drives the rivet of the sliding plate through the connecting plate to slide inside the rivet yieldvertical sliding long hole or the rivet inclined sliding long hole, meanwhile, the rivet drives the sliding plate to slide downwards through the connecting plate vertical sliding long hole so that theyarn pressing head can press yarns. The feeding mechanism of the yarn switcher can lower the yarn feeding point during yarn switching and ensure stable yarn feeding of the yarn switcher, and meanwhile, is simple in structure and capable of improving the production efficiency.