The　mechanical　behaviors　of　deep　rocks　have　always　posed　a　challenge　for　the　implementation　and　safe　operation　of　major　underground　engineering　projects.　To　this　end,　this　study　modified　the　existing　mainstream　rock　mechanics　instruments　equipped　with　a　dynamic　disturbance　loading　system　and　developed　a　second-generation　TFD-2000/D　triaxial　instrument.　The　first-generation　device　is　equipped　with　an　independent　disturbance　system　and　an　advanced　EDC-580　all-digital　servo　controller,　which　can　apply　disturbing　load　independently,　implement　the　function　of　cyclic　disturbance,　and　combine　dynamic　and　static　disturbances.　The　instrument　was　found　to　be　reliable　for　use　in　analyzing　the　damage　process　of　rocks　in　the　disturbance　test　of　marbles.　The　second-generation　instrument　tackles　three　limitations　of　the　first-generation　instrument:　(i)　it　upgrades　the　strain　measurement　system　and　uses　extensometers　with　linear　variable　differential　transformers　to　accurately　measure　deformation;　(ii)　it　uses　the　self-balanced　chamber　to　replace　the　Hoek–Franklin　triaxial　cell　and　auto-balancing　triaxial　pressure　chamber;　and　(iii)　the　loading　rod　is　independently　equipped　with　an　EDC-580　all-digital　servo　controller,　which　measures　precise　loads.　The　experimental　findings　confirmed　that　the　second-generation　instrument　can　be　used　for　rock　mechanics　testing　under　cyclic　disturbance　loading,　the　disturbance–stress　relaxation　cycle,　and　the　creep–fatigue　cycle.　In　this　sense,　the　second-generation　instrument　can　be　a　useful　addition　to　deep　rock　mechanical　instruments　and　provide　a　valuable　reference.　©　2023　The　Authors.　Deep　Underground　Science　and　Engineering　published　by　John　Wiley　&　Sons　Australia,　Ltd　on　behalf　of　China　University　of　Mining　and　Technology.