Tube-cutting device with relative moving generation part

The utility model provides a tube cutting device with a relative moving generation portion, which is chiefly composed of a relative moving generation portion, a tube cutting base portion, and a tube cutting sliding block. A manual input portion on the relative moving generation portion can be conveniently clamped by the user through applying the force; the tube cutting base portion and the tube cutting sliding block are provided with a rolling cutter, two auxiliary guide wheels, and a feed spring; after applying the pressure, through that one pushing pressing plate compresses a compression spring on the tube cutting sliding block. Therefore, the feed function can be obtained. In case that the force application is larger, a locking sheet which can be abutted makes that the tube cutting base portion and the tube cutting sliding block do not proceed the relative movement, and the purpose is to prevent the excess feed, which can destroy the tube which needs to be cut. The utility model has the advantages that the tube cutting device with the relative moving generation portion can quickly hold the tube; the excess force application can be prevented, and the tube-cutting device with the relative moving generation portion can cut the tube through automatic feed and hand feed, etc.