NOVELTY - Liquid film comprises 82-99 pts. wt. raw materials, 11-14 pts. wt. film-forming agent, 2-3 pts. wt. plasticizer, 1.3-2.5 pts. wt. crosslinking agent, 0.02-0.05 pt. wt. initiator, 0.2-0.3 pt. wt. pH regulator, and 0.1-0.3 pt. wt. additional component. The raw materials include 68-79 pts. wt. crop straw fermentation waste liquid, 7-10 pts. wt. bentonite, 2-3 pts. wt. modified starch, and 5-7 pts. wt. potassium humate. The additional component is Eupatorium adenophorum extraction liquid, potassium nitrate, trace elements, and/or composite microbial inoculum spore powder.    USE - Liquid film used for improving soil texture and soil structure.    ADVANTAGE - The liquid film has simple preparation, low cost, and low labor intensity, is convenient to use and degradable, and improves fertilizer efficiency.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of liquid film comprising preparing crop straw fermentation waste liquid comprising providing maize straw, wheat straw, rice straw, tobacco stalk, and/or bagasse, crushing into 1-2 cm particles, controlling the water content at 45-55%, soaking in water for 2-3 hours, adding into fermentation tank, adding 5 wt.% fermentation agent and 3% urea, checking the temperature change condition everyday, when the temperature reaches 50-60 degrees C, stirring the material once for 3-5 days, adding the fermentation material with 5-7 times clean water, stirring for 3-5 hours, and filtering to obtain crop straw fermentation waste liquid, raw material pretreatment step comprising adding bentonite and potassium humate into tank, mechanically stirring at high speed, grinding and dispersing, and obtaining bentonite solution, weighing modified starch and sodium bicarbonate, dissolving in waste liquor container filled with crop straw, stirring until completely dissolved, reacting under water bath at 70-90 degrees C for 40-60 hours, stirring once at an interval of 5 minutes until gelatinized uniformly, mixing uniformly with bentonite solution to obtain film-forming agent solution, weighing polyvinyl alcohol into container, adding crop straw fermentation waste liquid, putting the container in 90-98 degrees C constant temperature water to completely dissolve the polyvinyl alcohol, mixing at an interval of 5 minutes, where the process is completed within 30-40 minutes, obtaining polyvinyl alcohol solution, uniformly mixing polyvinylpyrrolidone and sodium alginate, filtering, adding the film-forming agent solution, 40-60 degrees C constant temperature heating and reacting for 30 minutes, adding crosslinking agent i.e. glutaraldehyde and initiator i.e. potassium persulfate or ammonium persulfate, completely dissolving, slowly adding the uniformly mixed polyvinyl alcohol solution while stirring, and mixing at constant temperature of 40-60 degrees C for 2-3 hours.