Abstract: ObjectiveThe goal of this article was to make pineapple leaf fiber into a regulated fiber membrane to pro-mote its application in industry and food industry,etc.MethodPineapple leaf fiber was the object of study.It was fully dissolved in ionic liquid 1-butyl-3-methylimidazole chloride(BmimCl)by shearing dissolved.High pressure homogeni-zation was conducted to study the structure control of pineapple leaf fiber membrane,and its effects on fiber membrane, structure and properties of fiber membrane were analyzed.ResultBy varying the pressure and frequency of high pressure homogenization,improving the disperse uniformity of the mixture including pineapple leaf fiber and ionic liquid,fiber membrane structure was more compact,the fiber membrane pore smaller,mechanical properties and air permeable perfor-mance better. Infrared spectrum and XRD analysis confirmed that high pressure homogenization would not destroy the structure of pineapple leaf fiber.Therefore,high pressure homogeneous technology could regulate and control the struc-ture of pineapple leaf fiber membrane,and the optimum process parameters were:high pressure homogenization treatment pressure 80 MPa for 15 times.The pineapple leaf fiber membrane tensile strength was 18.39 MPa in the experiment.It had good water vapor permeability and oxygen permeability,which was far superior to commercial PE film.ConclusionUsing high pressure homogenization technique with emulsion shear technique,the pineapple leaf fiber/ionic liquid is homogeneous.With this,pineapple leaf fiber membrane with fine mechanical performance,air and water permeability can be produced.In addition,the membranes structure can be regulated.Such fiber membranes can be widely applied in food fresh keeping.