The invention discloses a gear mesh type automatic wire feeding mechanism comprising a machine frame, a wire feeding turntable and a clamping and feeding mechanism. The wire feeding turntable and the clamping and feeding mechanism are installed on the machine frame; the clamping and feeding mechanism comprises an installation box, a servomotor, a driving gear, a driven gear, a rotating shaft and an elastic component, wherein an output shaft of the servomotor is fixedly connected with the driving gear and drives the driving gear; the rotating shaft pivotally passes through the driven gear in apivot connection way and is fixedly connected with one end of the elastic component with elasticity; the other end of the elastic component is fixedly connected with the internal wall of the installation box; the driving gear is meshed with the driven gear and drives the driven gear to rotate; the elastic component provides an elastic force for the driven gear to butt the driving gear; the driving gear and the driven gear are both provided with grooves, and a wire feeding passage is formed in a meshing position of the driving gear and the driven gear; and the installation box is provided witha wire feeding hole and a wire discharging hole which are opposite to the wire feeding passage. The invention has the advantages of simple structure, strong wire feeding force, stable feeding and strong wire feeding rigidity and can automatically adjust the meshing degree of the gears.