Agricultural mulching film capable of regulating and controlling degradation rate of full-biodegradable composite film by utilizing photodegradation technology

The invention relates to the technical field of agricultural mulching films, and discloses an agricultural mulching film capable of regulating and controlling the degradation rate of a full-biodegradable composite film by utilizing a photodegradation technology, the agricultural mulching film comprises an agricultural mulching film base material and biodegradable coatings, and the biodegradable coatings are distributed on the upper and lower surfaces of the base material; the agricultural mulching film base material is prepared from the following raw materials in parts by weight: 10-20 parts of polylactic acid, 30-50 parts of poly (butylene adipate-co-terephthalate), 2-5 parts of natural plant cellulose and 3-7 parts of a photosensitizer, the biodegradable coating is prepared from the following raw materials in parts by weight: 50 to 70 parts of polylactic acid, 10 to 20 parts of starch and 5 to 10 parts of cellulase. The agricultural mulching film disclosed by the invention has full biodegradability and is b