The invention discloses a water-retention and soil-
moisture-conservation biodegradable agricultural film with a self-water-absorption structure and a preparation method of the water-retention and soil-
moisture-conservation biodegradable agricultural film, and belongs to the technical field of degradable agricultural films. The agricultural film is formed by co-extruding an outer hydrophobic layer, a middle mechanical supporting layer and an inner hydrophilic layer, the outer hydrophobic layer is composed of a hydrophobic layer master batch and
polyester in a
mass ratio of (5-9): (1-5), and the hydrophobic layer master batch is prepared by blending and granulating
polylactic acid, hydrophobic layered nanosheets and auxiliaries; the middle mechanical supporting layer is composed of a mechanical supporting layer master batch and
polyester in a
mass ratio of (5-9): (1-5), and the mechanical supporting layer master batch is prepared by blending and granulating
polylactic acid, a bio-based filler and an auxiliary agent; the inner hydrophilic layer is composed of a hydrophilic layer master batch and
polyester in a
mass ratio of (5-9): (1-5), and the hydrophilic layer master batch is prepared by blending and granulating
polylactic acid, super-hydrophilic nanoparticles and an auxiliary agent; the prepared agricultural film has
water retention, hydrophobic and hydrophilic functions at the same time, has excellent
mechanical strength and
toughness, and can meet use requirements.