In order to improve the liquid directional transport capability of polylactic acid (PLA) micro-nanofibrous nonwovens. Polyethylene glycol (PEG) and sodium dodecyl sulfate (SDS) were selected to improve the hydrophilicity of PLA, and the biomimetic oriented PLA/PEG/SDS melt blown nonwoven was prepared by In-situ drafting process based on the melt blown hydrophilic modification, and the effects of different drafting ratios on the structure and properties of the materials were studied. The experimental results show that the glass transition temperature of the PLA/PEG/SDS blend polymer is about 50 ℃, which is suitable for drawing; as the drafting ratio increases from 1.0 to 2.0, the fibers with high orientation degree (orientation angle≤20°) The number increased from 10% to 67%, the longitudinal tensile breaking strength increased by 151.5%, and the liquid climbing height increased from 20 mm to 62 mm. The biomimetic oriented PLA/PEG/SDS melt blown nonwovens have improved fast wettability, thus satisfying their applications in microfluidic transport fields such as humidifiers, atomizers, and 3D printers.