In　order　to　study　the　dynamic　mechanical　properties　of　recycled　concrete　with　ferronickel　slag,　dynamic　experiments　on　cylindrical　specimens　(phi　73　mm　x　36.5　mm)　were　performed　using　a　split　Hopkinson　pressure　bar　(SHPB)　system.　The　effects　of　loading　rate　and　recycled　aggregate　replacement　rate　on　the　compressive　strength,　toughness　index,　peak　strain,　and　failure　pattern　of　the　concrete　were　investigated,　and　four　different　loading　rates　and　aggregate　replacement　rates　were　selected.　In　addition,　cohesive　elements　were　embedded　between　C3D8R　elements　in　the　numerical　model　using　Python　language　to　simulate　the　failure　process　of　the　recycled　concrete,　and　the　reliability　of　the　simulation　was　validated　by　the　obtained　experimental　results.　It　was　found　that　the　peak　strain　of　the　recycled　concrete　was　significantly　higher　than　that　of　the　ordinary　concrete;　however,　its　peak　stress　was　lower　than　that　of　the　ordinary　concrete.　In　comparison　to　the　recycled　concretes　containing　70%　and　100%　recycled　coarse　aggregates　(RCAs),　the　toughness　index　amplification　of　the　recycled　concrete　containing　30%　RCAs　was　the　most　obvious.　The　failure　pattern　and　mechanical　properties　of　the　numerical　model　were　consistent　with　those　of　the　test　specimens,　thus　validating　the　reliability　of　the　numerical　simulation.