Ammonia-hydrogen　blended　combustion　is　effective　approach　to　achieving　zero-carbon　emissions　in　the　Wankel　rotary　engine　(WRE).　This　study　proposes　hydrogen　direct　injection　(HDI)　strategy　that　enhances　in-charge　efficiency,　achieves　high-efficiency　combustion,　and　optimizes　the　injection　strategy　to　improve　the　performance　of　the　WRE.　Firstly,　the　effects　of　premixing　intake　and　HDI　under　different　excess　air　ratios　on　the　mixture　formation　and　performance　of　WRE　were　compared.　It　was　found　that　the　HDI　strategy　could　improve　the　indicated　mean　effective　pressure　(IMEP)　by　21.43　%.　Afterwards,　the　influence　of　9　cases　with　varying　hydrogen　nozzle　diameters　(HNDs)　and　hydrogen　injection　angles　(HIAs)　on　combustion　and　emissions　was　analyzed.　It　was　observed　that　the　decrease　of　HND　result　in　higher　injection　velocities,　which　affect　the　concentration　distribution　of　fuel　within　the　cylinder.　The　concentration　of　ammonia-hydrogen　fuel　near　the　spark　plug　is　crucial　for　combustion.　At　the　HIA　of　60　degrees,　a　significant　delay　in　ignition　was　observed　near　the　trailing　spark　plug.　When　the　HIA　is　set　to　45　degrees,　the　highest　indicated　thermal　efficiency　(ITE)　reaches　37.9　%　and　the　maximum　IMEP　is　0.68　MPa,　while　variations　of　HND　had　minimal　impact　on　ITE,　IMEP,　and　NOx　generation　in　the　WRE.