The work investigated the effect of crushed fibers of ultra-high molecular weight polyethylene (UHMWPE) before and after plasma treatment in air and argon with their content up to 1.0% of the mass. on the complex of physicochemical properties of polymeric composite materials (PCM) based on polyurethane. UHMWPE fibers were treated with a high-frequency capacitive discharge of lowtemperature plasma in order to increase the adhesive polymer-filler interaction. The effect of filling with plasma-treated UHMWPE on the main set of PCM strength indicators is estimated. It was Fundamental and applied problems of materials creation and phases of technologies for textile industry 142 revealed that the modification of the filler leads to a significant increase in the physical and mechanical parameters of PCM with its use.