Cutting knife structure of film expanding machine

The utility model provides a cutting knife structure of a film expanding machine, and belongs to the technical field of film expanding machine equipment. A bottom plate is arranged above the fixed seat, the bottom plate is connected with the fixed seat through a first lifting assembly, a cutting knife bottom plate is arranged above the bottom plate, a cutting knife seat is connected with the bottom plate through a second lifting assembly, a cutting knife mechanism is connected above the cutting knife bottom plate through a connecting rod, the cutting knife mechanism comprises the cutting knife seat, and a table disc inner ring is arranged in the middle of the cutting knife seat. An annular table disc outer ring is arranged on the outer side of the table disc inner ring, a film expanding ring is formed between the table disc inner ring and the table disc outer ring, and an annular tooth-shaped blade is arranged on the outer side of the table disc outer ring. The control precision of the film expanding machine