The utility model discloses a plastic film perforating device that before is used for under membrane tobacco seedling to draw seedling, including making perforated disks, first needle file, the first needle tubing that punches, second needle file, second punch needle tubing, action bars, beat perforated disks and upward use the centre of a circle of beating perforated disks will beat the perforated disks quotation and divide into between the trisection fan section as center, division line, be provided with 2~3 first set of holes near beating perforated disks edge in between the fan section, be provided with 3~4 second dish holes on the division line respectively, the bottom of beating perforated disks is located to first needle file, and just the upper portion of first needle file can be dismantled with first set of hole and is connected, the bottom of beating perforated disks is located to the second needle file, and the upper portion of second needle file and second coil the hole and can dismantle and be connected, the first vertical bottom of locating first needle file of needle tubing of punching, the second vertical bottom of locating the second needle file of needle tubing of punching, first perforating needle bore of pipe is greater than second perforating needle bore of pipe, the action bars sets up the center on beating perforated disks.