The invention provides a cutting mechanism for a film slitting machine, belongs to the technical field of mechanisms, and aims at solving the technical problem that a cutting mechanism for an existingfilm slitting machine is poor in cutting effect and cannot be used for cutting films with different widths. The cutting mechanism for the film splitting machine is characterized in that the film slitting machine comprises a rack, wherein a feed roller is rotatably arranged on the rack; a coiling mechanism for coiling a film is arranged on the rack, and the coiling mechanism comprises a coiling rod I and a coiling rod II. The cutting mechanism comprises a first transverse rod and a second transverse rod; the first transverse rod is connected to a pushing rod motor by which the first transverserod can be driven to move upwards or downwards; the pushing rod motor is fixedly arranged on the rack; a plurality of sliding rods are fixedly arranged at the upper end of the second transverse rod;the second transverse rod is slidingly arranged on the rack through the sliding rods; a limiting block for preventing each sliding rod from falling off from the rack is fixedly arranged at the end part of sliding rod. The cutting mechanism has the advantages of being adjustable in film cutting width, and good in cutting effect.