The invention provides a single cutter plastic pipe rotating cutting device, which solves the technical problem that plastic pipes with different thicknesses cannot be subjected to rotating cutting. The single cutter plastic pipe rotating cutting device comprises a machine case, a rotating power driving mechanism, a swinging frame, a combined cutter cutting mechanism, a swinging frame driving mechanism and a control system, wherein the rotating power mechanism comprises a rotating driving motor, a driving gear belt wheel, a driven gear belt wheel, a tooth-shaped belt and a rotating disc; the combined cutter cutting mechanism comprises a cutting driving motor and a cutter knife; the swinging frame driving mechanism comprises a swinging driving motor, a speed reducer, a swinging frame driving lead screw and a swinging frame driving screw nut. The single cutter plastic pipe rotating cutting device has the beneficial effects that the rotating cutting on the plastic pipes can be realized; the cutting of the combined cutter cutting mechanism on the plastic pipes with different thicknesses can be realized through the matched use of the swinging frame and the swinging frame driving mechanism.