The invention provides degradable bio-based liquid agricultural film. The degradable bio-based liquid agricultural film is prepared from cellulose sulfuric acid monoester salt, hemicellulose sulfuric acid monoester salt, lignin sulfuric acid monoester salt, water and humic acid sulfuric acid monoester salt. The invention further provides a production method of the degradable bio-based liquid agricultural film. The bio-based liquid agricultural film can keep the relatively constant temperature and humidity in the root zone, decrease the seedling death rate in the high temperature season, promote plant photosynthesis and underground root system development and reduce virus diseases; in addition, the bio-based liquid agricultural film contains multiple natural active groups and heterogeneous phenol compounds and can be easily degraded by microorganisms in soil, and humic acid in degradation products can increase the granular structures of the soil and keep balance of trace elements in the soil.