Ultra-high-performance　concrete　(UHPC)　possesses　exceptional　mechanical　properties　and　durability,　offering　vast　potential　in　bridge　construction,　high-rise　buildings,　and　protective　engineering.　However,　UHPC　demands　high-quality　raw　materials　and　exhibits　significantly　higher　autogenous　shrinkage　than　ordinary　concrete.　Therefore,　developing　a　new　type　of　UHPC　that　is　both　ecologically　and　economically　friendly,　with　high　strength　and　low　shrinkage,　is　of　great　importance.　This　study,　based　on　the　optimal　selection　strategy　for　the　aggregate　system,　gradually　replaced　natural　quartz　sand　(QS)　with　air-cooled　ferrochrome　slag　aggregate　(FSA)　from　0　wt%　to　100　wt%,　and　then　utilized　pre-wetted　autoclaved　artificial　aggregate　(AA)　as　an　internal　curing　material.　This　approach　successfully　developed　an　economically　and　environmentally　friendly　UHPC　material　composed　entirely　of　waste　aggregate,　addressing　the　challenge　of　balancing　compressive　strength　with　autogenous　shrinkage　deformation.　The　study　investigated　the　effects　of　FSA　and　AA　on　the　fresh　properties　of　UHPC　through　fluidity,　wet　density,　and　setting　time,　analyzed　basic　mechanical　behavior　through　cube　compressive　strength　test,　and　observed　autogenous　shrinkage　using　the　corrugated　tube　method　and　embedded　humidity　sensors.　The　synergistic　mechanism　of　the　dual　waste　aggregates　was　revealed　through　hydration　heat,　thermogravimetric　analysis,　and　mercury　intrusion　porosimetry.　The　results　show　that　UHPC　using　only　FSA　achieved　nearly　200　MPa　strength,　and　adding　AA　maintained　a　28-day　strength　of　approximately　150　MPa　while　reducing　autogenous　shrinkage　by　33.4　%.　Compared　to　the　reference　group,　the　cost　per　unit　of　UHPC　with　all-waste　aggregates　can　be　reduced　by　up　to　32.9　%.　Future　research　should　focus　on　optimizing　the　aggregate　properties　and　evaluating　the　long-term　durability　and　life　cycle　environmental　impacts　to　facilitate　large-scale　practical　applications　of　this　sustainable　UHPC.　©　2025　The　Authors