fibers to form mixed fibers the nanoclay suspension was sprayed into the mixed fibers of hemp fibers with polypropylene fibers in the shredding stage and after shredding carding needle punching and hot pressing a composite material having a surface density of 1500 g m 2 was prepared where the preheating temperature is 210 u00b0 c the preheating time was 40 s and the dwell time was 35 s the results of voc detection in the composite material of this example were as follows compared with the foregoing comparative example 1 the contents of formaldehyde acetaldehyde and tvoc in the composite material prepared in this example were all significantly reduced greatly reducing the harm of the material to the environment and human body a method for preparing a low voc natural fiber composite material according to a second embodiment of the present invention is introduced below in this embodiment modified synthetic fibers are mixed with natural fibers and other fibers to prepare mixed fibers the natural fibers and the other fibers are mixed at a mass ratio of 9 1 to 1 9 and preferably 9 1 to 6 4 optionally only the foregoing step s 1 and step s 2 are performed and the step s 3 is not performed in this embodiment and this embodiment also can achieve the objective and expected technical effect of the present invention in the present invention the application of other fibers.