To provide a plastic film winding method capable of securing a favorable changing property by changing a full winding core to an empty new winding core to solve such a problem that a cross cutter idles and a cut film end is flipped and folded by a cutting blade when a film is wound around the new winding core, and a winding device.

In this plastic film winding method and a winding device, when a plastic film 8 between the full winding core and the empty winding core 6 is cut by a cutting blade 1 at changing the winding core of the film 8, an end of the plastic film 8 to be cut is guided to a blade part of the cutting blade 1, and a cut end of the plastic film 8 cut by the cutting blade 1 is introduced to a winding direction of the new winding core 6.