The invention relates to a file plastic packaging machine. The file plastic packaging machine comprises a film feeding mechanism, wherein a transfer mechanism is installed on the right side of the film feeding mechanism, and a film sealing mechanism is arranged on the right side of the transfer mechanism. The film feeding mechanism comprises a shell and a supporting frame, wherein a feeding opening and a discharging opening are formed in the two sides of the shell, a limiting sliding groove is welded to the top surface wall of the inner side of the shell, a rotating rod is rotatably connectedto the top surface wall of the inner side of the shell through a rotating shaft, a sliding groove is formed in the side, close to the discharging opening, of the top of the shell, a sliding rod is slidably embedded in the sliding groove, two rollers are rotatably connected to the bottom of the sliding rod through pin shafts, and a fixed rod is welded to the top surface wall of the inner side of the shell and located between the sliding groove and the limiting sliding groove. According to the file plastic packaging machine, the problems that shrink films of a current file plastic packaging machine cannot be aligned, the automatic classification and packaging cannot be carried out according to the number of pages of a file, the scanning and filing of file contents cannot be carried out, airis liable to entry during plastic packaging of the file, and folding and falling are prone to occurring during plastic packaging are solved.