The invention discloses a biodegradable liquid agricultural film, and relates to a liquid ground film. The invention aims at solving the problems that the current liquid ground film contains a great amount of petrol derivatives, is not easy to be degraded, can harden soil and generate 
toxicity after a long term application, and that the 
raw material resource is limited and the cost is comparatively high. The liquid agricultural film of the invention is made from 10 portions to 50 portions of 
plant straw, more than 0 portion to 30 portions of 
humic acid, 30 portions to 70 portions of water, 3 portions to 15 portions of film-forming agent, 0.5 portion to 1 portion of surfactant, more than 0 portion to 20 portions of 
fertilizer and more than 0 portion to 20 portions of stabilizer by weight. The liquid agricultural film of the invention can be made by the spraying of ordinary sprayers, thus saving labor, time and energy and avoiding the operations of 
seedling placing and waste film collection. After 2 months to 3 months, the agricultural film starts to be degraded into 
organic fertilizer of 
humic acid and the final degradation product is 
carbon dioxide and water. The agricultural film can be complexed with fertilizers and 
pesticide to prolong the fertilization effect and 
drug effect. The 
ground temperature can be increased by 1 DEG C to 6 DEG C and the 
crop output can be increased by 6 percent to 50 percent.