High-order　Bessel　beams　are　of　great　interest　for　most　stable　long-range　optical　quantum　communications　due　to　their　unique　nondiffraction,self-healing,and　orbital　angular-momentum-carrying　capabilities.Until　now,meta-surfaces　based　on　Bessel　beam　generators　are　mostly　static　and　focused　on　generating　zero-order　Bessel　beams.A　moiré　meta-device　made　of　two　cascaded　metasurfaces　is　a　simple,effective　strategy　to　dynamically　manipulate　the　wavefront　of　electromagnetic(EM)waves　by　mutual　rotation　between　the　two　metasurfaces.Here,an　all-dielectric　moiré　meta-device　integrated　with　the　functions　of　an　axicon　and　a　spiral　phase　plate　to　generate　terahertz　Bessel　beams　is　designed.Not　only　the　order,but　also　the　nondiffraction　length　of　the　generated　Bessel　beam　can　be　continuously　tuned.As　a　proof　of　concept　of　the　feasibility　of　the　platform,the　case　of　tuning　order　is　exper-imentally　demonstrated.The　experimental　results　are　in　good　agreement　with　the　theoretical　expectations.In　addition,we　also　numerically　proved　that　the　nondiffraction　length　of　the　Bessel　beam　can　be　adjusted　with　the　same　approach.The　moiré　meta-device　platform　is　powerful　in　dynamically　manipulating　the　wavefront　of　EM　waves　and　provides　an　effective　strategy　for　continuously　controlling　the　properties　of　the　Bessel　beam,which　may　find　applications　in　optical　communications,particle　manipulation,and　super-resolution　imaging.