AbstractIn order to obtain a material that exhibits a better tensile strength, UV absorption, and transparency, lignocellulose of eucalyptus was dissolved and subsequently regenerated in ionic liquid (IL) following treatment with different pretreatment conditions. The effect of 1,4-dioxane extraction concentration was evaluated by comparing the chemical, thermal, mechanical, and optical performance of the obtained films. The results indicated that lignocellulose could be dissolved using the IL, with the regenerated film demonstrating obvious signs of phase separation. Increasing the 1,4-dioxane extraction concentration brought about an increase in the degree of crystallization, tensile stress, and ultraviolet-visible light transmittance of films. However, the lignin content and peak temperature of main decomposition for the films decreased. Compared to cellulose film, lignocellulose film showed excellent UV absorption properties due to the presence of lignin. F-90 possessed of a better tensile strength, UV absorption, and transparency. This work demonstrated the possibility that a biodegradable green functional film can be prepared.