The　propagation　characteristics　of　stress　waves　in　rocks　are　a　crucial　research　topic　in　rock　mechanics　and　geotechnical　engineering,　the　velocity　of　stress　waves　can　extract　internal　information　from　rock　formations,　which　is　crucial　for　determining　the　structure　of　the　Earth＇s　crust.　Under　high-temperature　conditions　such　as　geothermal　environments　or　tunnel　fires,　the　physical　and　mechanical　properties　of　rocks　can　be　altered,　leading　to　crack　initiation　and　development,　thereby　significantly　affecting　stress　wave　propagation　in　rocks.　Based　on　the　drop　hammer　impact　experiments,　this　study　employs　the　coupled　Distinct　Lattice　Spring　Model　(DLSM)　and　Discontinuous　Deformation　Analysis　(DDA)　numerical　method　(DLSM-DDA)　to　simulate　the　experimental　results.　Further,　parametric　simulations　of　stress　wave　propagation　in　rock　with　various　cracks　are　conducted　to　reveal　the　influence　mechanisms　of　high-temperature　damage　on　stress　wave　propagation　in　rocks.　The　study　finds　that　under　high-temperature　conditions,　both　the　length　and　density　of　cracks　in　rocks　are　critical　factors　influencing　stress　wave　propagation.　Short　and　long　cracks　exhibit　distinct　effects　on　wave　propagation,　with　changes　in　the　growth　and　density　of　short　cracks　having　a　minor　impact　on　wave　velocity　until　these　cracks　coalesce　into　longer　ones.　The　critical　length　for　this　transition　is　approximately　between　2.4　mm　and　3.6　mm.　Furthermore,　the　study　demonstrates　that　crack　length　influences　wave　propagation　velocity　in　a　power-law　manner,　while　crack　density　affects　velocity　linearly,　with　their　growth　rates　influencing　each　other.　Despite　significant　impacts　from　both　crack　length　and　density　on　wave　velocity,　crack　length　exerts　a　notably　stronger　influence　compared　to　crack　density,　affecting　velocity　roughly　2-3　times　more　than　crack　density.