本发明涉及一种聚合物微纳米纤维的制备方法。采用由两台挤出机、两个熔体泵、共挤出汇流器及分层叠加单元、纤维切割模具组成的微纳层共挤出装置,将两种聚合物树脂分别通过两台挤出机进行熔融挤出,再将熔融物料输送至共挤出汇流器,并在此汇合成双层熔体,在分层叠加单元中进行垂直切割分成二料流、水平展开及重新合并,从而使层的数 The present invention relates to a method for preparing polymer micro-nanofibers. Using two extruders, two melt pumps, coextrusion manifolds and layered stacking units, fiber cutting dies consisting of micro-nano co-extrusion device, the two polymer resins were extruded through two Machine for melt extrusion, and then the molten material is fed to the co-extrusion manifold, and in this merged into a double melt in the layered stacking unit for vertical cutting into two streams, the horizontal expansion and re-merge so that The number of layers