High-entropy　carbide　ceramics　have　received　extensive　attention　because　of　their　excellent　mechanical　properties　and　better　oxidation　resistance.　However,　the　additive　phase　of　Ti(C,N)-based　cermets　has　not　been　reported　yet.　In　this　study,　(HfZrTaNbTi)C5　high-entropy　ceramics　(HECs)　with　equal　atomic　ratios　were　successfully　prepared　by　high-energy　ball　milling.　The　results　show　that　the　HECs　possess　a　single-phase　cubic　rock　salt　structure,　fine　grains,　and　a　uniform　element　distribution.　Then,　it　was　used　as　the　additive　phase　of　Ti　(C,N)-based　cermets.　And　with　AlCoCrFeNi2.1　high-entropy　alloy　(HEA)　as　binder,　Ti(C,N)-HECs-HEA　high-entropy　cermet　block　materials　was　successfully　prepared　by　SPS　technology.　The　room　temperature　mechanical　properties　and　high-temperature　oxidation　properties　of　high-entropy　cermets　have　been　studied.　The　results　show　that　unlike　traditional　Ti(C,N)-based　cermets,　the　hard　phase　of　high-entropy　cermets　is　composed　of　black　core-white　inner　ring-grey　outer　ring　grains　and　grey　grains.　The　grey　contrast　phase　is　the　newly　formed　(HfZrNbTaTi)(C,N)　high-entropy　ceramic　phase.　Compared　with　traditional　Ti(C,N)-based　cermets,　high-entropy　cermets　not　only　have　a　considerable　hardness　(1780.3　HV)　but　also　have　relatively　higher　Vickers　indentation　fracture　toughness　(9.22　MPa　m1/2)　and　bending　strength　(1315　MPa).　After　being　oxidized　in　air　at　1000　degrees　C　for　60　min,　the　high-entropy　cermets　shows　excellent　oxidation　resistance,　with　a　dense　oxide　layer　and　fine　oxide　particles.　The　continuous　and　dense　oxide　layer　effectively　prevents　the　transport　of　oxygen　into　the　cermets　matrix.　And　the　lattice　distortion　effect　and　slow　diffusion　effect　of　high-entropy　alloys　and　high-entropy　ceramics　retard　the　diffusion　of　elements.