The invention aims to provide a plastic film roll cutting machine. The machine comprises a manual hydraulic pump and a plastic film cutting device, the plastic film cutting device comprises a bottom plate, a cover plate, a manual hydraulic pump mounting seat, a cutter plate, cutter plate guide rail sliding seats, cutter plate guide rail sliding blocks, an upper plastic film positioning cylinder and a lower plastic film positioning cylinder, wherein the upper plastic film positioning cylinder and the lower plastic film positioning cylinder vertically communicate, one end of the bottom plate isprovided with the manual hydraulic pump mounting base, the other end of the bottom plate is provided with the lower plastic film positioning cylinder, the cutter plate guide rail sliding seats are symmetrically arranged in the middle of the bottom plate, limiting columns are arranged on the outer sides of the cutter plate guide rail sliding seats, the plug column end of the manual hydraulic pump is installed on the bottom plate through the manual hydraulic pump mounting base, a pressure spring is fixedly connected to the cutter back side of the cutter plate, the other end of the pressure spring is fixedly connected with a plug column of the manual hydraulic pump, the cutter plate guide rail sliding blocks are fixedly connected to the left side and the right side of the cutter plate, one end of the cutter cover plate is hinged to the manual hydraulic pump mounting seat, and the other end of the cutter cover plate is provided with the upper plastic film positioning cylinder. The machineis high in cutting efficiency, and high in cutting accuracy and has the advantages of being safe and reliable.