Cold cutting snare

The invention relates to the technical field of medical instruments, in particular to a cold cutting snare which comprises a driving assembly, a first flexible connecting pipe, a second flexible connecting pipe and a snare assembly, the driving assembly serves as a reciprocating control mechanism to control the cold cutting snare to work, and the first flexible connecting pipe is fixedly connected to one end of the driving assembly. Compared with the prior art, the cutting device has the following advantages that the second flexible connecting pipe capable of reciprocating is arranged, so that the cutting mechanism arranged on the end side of the first flexible connecting pipe can be hidden or exposed, a cutter can be prevented from damaging equipment or human tissues during hiding, and the second flexible connecting pipe can be matched with a loop for cutting when exposed; the cutting quality and the cutting speed are improved; the serrated positioning piece is arranged on the first contraction part, so that