A　new　type　of　negative　stiffness　friction　damping　device　(NSFDD)　was　developed　in　this　study,　which　can　solve　the　problem　of　poor　energy　dissipation　of　the　existing　passive　negative　stiffness　damping　device.　The　friction　force　is　generated　by　squeezing　the　friction　plate　with　the　preloaded　nitrogen　spring　vertically.　When　the　NSFDD　is　working,　the　friction　plate　causes　the　nitrogen　spring　to　rotate　and　negative　stiffness　force　and　friction　force　are　generated.　The　results　of　the　performance　test　show　that　the　NSFDD　can　achieve　negative　stiffness　in　the　hysteretic　model.　Comparing　with　the　existing　negative　stiffness　device,　the　NSFDD　has　larger　stroke,　more　stable　negative　stiffness　and　better　energy　dissipation　capacity.　The　finite　element　software　has　been　used　to　simulate　the　low　cycle　reciprocation　of　a　structure,　and　the　results　show　that　the　NSFDD　reduces　the　stiffness　of　the　structure　while　increasing　the　damping　of　the　structure.　The　results　of　the　simulation　and　analysis　of　the　shock　absorption　plan　of　the　NSFDD　show　that　the　NSFDD　reduces　the　stiffness　of　the　floor,　thereby　effectively　control　on　the　shear　force,　displacement　and　acceleration　response　of　the　structure.