Pre-cutting and chamfer cutting device for needle tubing automatically cutting machine

The invention provides a pre-cutting and chamfer cutting device for a needle tubing automatically cutting machine. The cutting device comprises a cutter rest, a motor and a rotary cutter head, whereinthe motor drives the cutter rest to rotate, the cutter rest is provided with a cutter head swing rod, a propelling inclined block and a cutter head installing groove; the rotary cutter head is arranged on the cutter rest, wherein the rotary cutter head comprises a pre-cutting cutter head and a chamfering cutter head, the pre-cutting cutter head and the chamfering cutter head, in an upper-and-lower relative position, are arranged in the cutter head installing groove through cutter head bases, and the pre-cutting cutter head is a incisive sharp cutter head, and the chamfering cutter head is a blunt cutter head with a trapezoidal section; one ends of the two cutter head bases are matched with the pre-cutting cutter head and the chamfering cutter head respectively, and the other ends of the two cutter head bases are