The work aims to study the effects of hexagonal Boron Nitride with different mass frictions on the mechanical properties of PP/calcium sulfate whisker. First of all, the surface of hexagonal Boron Nitride (hBN) was modified. Then, hBN was evenly mixed with polypropylene (PP), modified calcium sulfate whiskers (CSW) and maleic anhydride grafted polypropylene (PP-g-MAH) by high-speed mixer. Finally, the twin-roll plastic refining machine was used to prepare PP/CSW/hBN composites by the method of melt blending. The results showed that, when the mass friction of hBN was about 1%～1.5%, pp/csw/hbn had the best mechanical property. When the mass friction of hBN was 1.5%, the friction coefficient and wear rate of the composite were the lowest. After the hBN surface is modified, its dispersity in the composite is improved and the binding force between hBN and polypropylene matrix interface is improved, which has an effect on the performances of reinforcement, toughening and abrasion resistance of PP composites. When the mass fraction of hBN reaches a certain amount, agglomeration will occur inside the composites, thus reducing the mechanical and fraction properties of composites.