Pipe cutting device

The invention discloses a pipe cutting device which comprises a rack, a linear motion mechanism, a guide mechanism, a limiting mechanism and a cutting mechanism, and the guide mechanism is installed on the linear motion mechanism and used for allowing a pipe to penetrate through; the limiting mechanism is mounted on the linear motion mechanism, and the limiting mechanism and the guide mechanism are arranged at an interval so as to limit and abut against the pipe; the cut-off mechanism is movably mounted on the linear motion mechanism, and the cut-off mechanism cuts off the pipe when the pipe abuts against the limiting mechanism; the linear motion mechanism drives the guide mechanism, the cutting mechanism and the limiting mechanism to do reciprocating linear motion relative to the rack. According to the technical scheme, the guide mechanism, the cut-off mechanism and the limiting mechanism are driven by the linear motion mechanism to advance at the same speed along with the pipe, then the cut-off mechanism ca