Automatic yarn feeding device capable of stably clamping and cutting yarn

The automatic yarn feeding device capable of stably clamping and cutting the yarn effectively achieves the purposes of automatically cutting off the yarn and clamping the yarn and comprises a supporting seat, the left end of the supporting seat is slidably connected with a supporting column, the right end of the supporting column is fixedly connected with a first electric push rod, and the right end of the first electric push rod is rotatably connected with a second electric push rod; a driving mechanism is arranged at the left end of the second electric push rod, a C-shaped plate is arranged at the lower end of the second electric push rod, a concave plate and a convex plate are slidably connected to the left and right ends of the C-shaped plate respectively, a first hydraulic rod is fixedly connected to the left end of the concave plate, and a first gear is rotatably connected to the lower end of the second electric push rod; through cooperation of a driving mechanism, a C-shaped plate, a concave plate, a c