A green and biodegradable hemp/cotton spunlaced nonwoven was developed to research oil flowing property and practical application. The filtration area of nonwoven and flux of experimental oil have great influence on pressure drop. Filtration area, thickness, mean pore diameter, porosity, and fiber diameter of hemp/cotton spunlaced nonwoven, flux, and density of experimental oil are used to verify previous pressure drop theories and permeability coefficients. The results demonstrate that Reynolds number of hemp/cotton spunlaced nonwoven at different fluxes is small (Re <1) at the state of laminar flow. Through 2D simulation of oil flowing through porosities of hemp/cotton spunlaced nonwoven on the basis of uniformly and disorderly arrangement fiber model, the results indicate that streamline of oil is curve in porosities in the case of fiber disorderly arrangement model. This paper mainly focuses on combining with practical application and theoretical simulation for better understanding the streamline shape and pressure drop distribution in the pores of material as clean oil flowing through porous nonwoven.