The　cracking　of　geopolymer　caused　by　its　brittleness　characteristics　could　reduce　the　stability　and　durability　of　the　building　structure.　Studying　the　cracking　behavior　of　fiber-reinforced　geopolymer　composites　(FRGCs)　is　important　to　evaluate　the　toughness　strengthening　of　geopolymer.　This　paper　presents　a　real-time　study　on　the　cracking　characteristics　of　FRGCs　under　splitting　tensile　load　based　on　high-speed　digital　image　correlation　(HDIC)　technology.　The　splitting　tensile　test　was　conducted　on　the　FRGC　with　different　fiber　content.　The　real-time　variation　of　strain　and　displacement　field　during　the　splitting　process　was　analyzed.　The　influence　of　fiber　content　on　the　mechanical　properties　and　crack　behavior　of　FRGCs　was　discussed.　Considering　the　splitting　strength　and　crack　width,　the　optimal　fiber　content　for　FRGCs　that　satisfied　the　crack　resistance　requirement　was　proposed.　The　results　show　that　the　incorporation　of　fiber　can　delay　the　cracking　time　and　reduce　strain　change　during　the　splitting　process.　The　splitting　tensile　strength　and　the　deformation　increase　as　fiber　content　increases,　while　the　crack　width　decreases　as　fiber　content　increases.　The　FRGC　with　2.0%　fiber　content　can　maintain　a　crack　width　smaller　than　0.1　mm,　which　satisfies　the　crack　resistance　requirements　of　practical　engineering　for　economic　consideration.