In　this　paper,　an　improved　meshless　artificial　viscosity　(AV)　method　is　proposed　and　combined　with　the　local　radial　point　interpolation　method　(LRPIM)　and　the　MacCormack　method　to　establish　a　newly-developed　meshless　numerical　model,　which　can　efficiently　and　accurately　solve　wet-dry　moving　interfaces　problems　of　shallow　water　flow.　As　an　important　model　describing　shallow　water　flow,　the　two-dimensional　(2D)　shallow　water　equations　(SWEs)　are　a　hyperbolic　system　of　1st-order　nonlinear　partial　differential　equations　which　have　a　characteristic　of　strong　gradient.　The　LRPIM　and　MacCormack　method　are　adopted　to　discretize　the　2D　SWEs　spatially　and　temporally,　respectively.　Meanwhile,　the　method　of　selecting　the　different　shape　of　support　domain　in　the　LRPIM　is　employed　for　properly　cooperating　with　the　MacCormack　method　to　accurately　capture　the　direction　of　wave　propagation.　For　eliminating　the　non-physical　oscillation　at　the　discontinuity　of　shallow　water　flow,　the　improved　meshless　AV　form　is　first　presented.　Four　challenging　numerical　examples　were　selected　to　verify　the　proposed　model　by　comparing　with　the　other　solutions　and　experimental　observations.　The　results　indicate　that　the　proposed　method　with　improved　meshless　AV　can　accurately　capture　the　shock　waves　and　efficiently　simulate　the　wet-dry　front　changes.　©　2021