Transparent degradable bubble film and preparation method thereof

The invention relates to a transparent degradable bubble film, which comprises the following components by mass: 50-80% of cellulose acetate; 10%-45% of a plasticizer; and 0.1-10% of an epoxy compound. The preparation method of the transparent degradable bubble film comprises the following steps: (1) drying cellulose acetate powder, and fully mixing the cellulose acetate powder with a plasticizer and an epoxy compound; (2) extruding and granulating through a twin-screw extruder to prepare plasticized particles; and (3) carrying out extrusion film forming by using a double-opening die extruder, processing into two films with different thicknesses, preparing the thicker film into a single air bubble film by using a plastic uptake roller, and then carrying out hot-pressing compounding on the single air bubble film and the other thinner film to prepare the air bubble film. The elongation at break of the transparent degradable bubble film can reach 40% or above, the light transmittance is high so that the state of