The invention relates to a precise punching device special for a cylindrical PV plastic film. The precise punching device comprises a bottom plate. A movable conversion supporting device is installed at the rear side of the bottom plate. Four supporting pillars are symmetrically installed at the front end of the bottom plate. The upper ends of the four supporting pillars are provided with a punching device. The conversion supporting device and the punching device are used in cooperation to complete the punching technology of a plastic film roll. By means of the precise punching device special for the cylindrical PV plastic film, the problems that in the existing punching work process of the cylindrical PVC film, the requirements for hole diameters are different for PVC films applied to different fields, corresponding hole diameters need to be replaced through manual work, operation is complex, the requirements for inner diameters are different for the PVC films applied to different fields, corresponding supporting parts need to be replaced manually, the work efficiency is reduced, in addition, the PVC film is wound around a paper shell, so that deformation is likely to deform in the punching process, and consequently the punching precision is low and the use effect of the PVC film is affected can be solved; and the precise punching function can be achieved for the cylindrical PVC film.