Stone-sawing　mud　(SSM)　is　a　solid　waste　generated　during　stone　processing,　with　a　presently　estimated　global　production　of　30　million　m3.　SSM　is　usually　disposed　of　in　the　stone　yard,　occupying　a　large　area　of　land　and　causing　serious　dust　and　water　pollution.　In　this　study,　a　novel　shape-stabilized　composite　phase　change　material　(ss-CPCM)　containing　SSM　loaded　with　NaNO3　was　prepared　using　the　mixing　and　sintering　method　for　medium-high　temperature　thermal　energy-storage　applications.　The　ss-CPCM　retained　50　wt%　NaNO3　without　leakage.　X-ray　diffraction　analysis　showed　good　chemical　compatibility　between　the　SSM　and　NaNO3,　and　microscopy　analysis　demonstrated　that　NaNO3　was　uniformly　distributed　within　the　SSM　structure.　The　compressive　strength　of　the　ss-CPCM　reached　23.14　MPa.　The　melting　temperature　and　latent　heat　of　the　ss-CPCM　are　approximately　306.78　°C　and　79.86　J·g−1,　respectively,　and　no　significant　variations　are　observed　after　thermal　cycling.　The　energy　storage　density　of　the　material　is　444.86　J·g−1　in　the　range　of　50–400　°C,　and　its　thermal　conductivity　is　0.696　W　(m·K)−1.　Furthermore,　the　thermal　conductivity　of　the　composites　reached　2.421　W　(m·K)−1　with　the　addition　of　10　wt%　of　graphite.　Hence,　the　NaNO3/SSM　ss-CPCM　is　considered　a　promising　material　for　waste　heat　recovery,　thereby　providing　a　valorisation　method　for　the　resource　utilisation　of　SSM.　©　2022　Elsevier　Ltd