In　this　paper,　the　effect　of　High-Toughness　Polypropylene　(HTPP)　fibers　admixture　(0,　0.3　%,　0.6　%,　0.9　%)　on　the　mechanical　properties　of　ceramsite　concrete　was　investigated,　and　four　kinds　of　ceramsite　concrete　specimens　were　prepared　and　tested　for　various　kinds　of　ceramsite　concrete　compressive　strength,　flexural　strength,　and　stress-strain　curves,　and　the　performance　characteristics　obtained　include　the　strength-to-weight　ratio,　flexural-to-compressive　ratio,　tensile-to-compressive　ratio,　compressive　toughness　index,　and　failure　morphology.　Furthermore,　combined　with　Scanning　Electron　Microscope　(SEM)　images,　we　analyzed　the　enhancement　mechanism　of　basic　mechanical　properties　of　ceramic　concrete　by　HTPP　fibers.　The　results　show　that　HTPP　fibers　can　effectively　improve　the　strength　and　toughness　performance　of　ceramsite　concrete,　and　the　effect　on　improving　toughness　performance　is　more　significant;　After　adding　HTPP　fibers,　the　compressive　strength　of　ceramsite　concrete　increased　by　26.3　%,　the　flexural　strength　increased　by　29.7　%,　the　toughness　index　increased　by　28.9　%,　and　the　strength　to　weight　ratio　increased　by　24.1　%;　After　adding　HTPP　fibers,　the　brittle　failure　characteristics　of　concrete　are　significantly　weakened,　and　when　it　fails　under　load,　it　can　still　maintain　good　integrity,　without　scattering　or　continuous　cracking.　Based　on　the　SEM　test　results,　the　mechanism　of　HTPP　fibers　reinforced　ceramsite　concrete　was　explained,　mainly　attributed　to　three　aspects:　fibers　preventing　ceramsite　from　floating,　fiber　surface　maintaining　good　bonding　with　cement　matrix,　and　effective　synergistic　bearing　between　fibers　and　ceramsite　concrete.　The　research　findings　of　this　study　can　provide　a　theoretical　foundation　for　the　structural　analysis　and　design　of　this　type　of　concrete.　It　will　be　beneficial　for　the　use　of　ceramsite　concrete　as　a　structural　material　and　holds　significant　implications　for　the　advancement　of　prefabricated　lightweight　wall　panels.　©　2023