Abstract: A plastic pipe cutting device includes a housing, a cutter connected to a tensile spring at a rear side in the housing and adapted for cutting a plastic pipe inserted into the housing, a lever pivoted to the housing and adapted to drive the cutter, a driving block supported on a spring in the lever and adapted for turning with the lever to move the cutter forwards, a stop member adapted to stop the cutter from backward movement, and a push block slidably mounted in the housing and adapted to push the stop member away from the cutter for enabling the cutter to be automatically pulled back by the tensile spring to its stand-by position after the loaded plastic pipe had been cut.