This　paper　reports　a　quick　preparing　super-hydrophilic　strontium　titanate　surface　method　by　picosecond　laser　processing.　At　room　temperature,　by　picosecond　laser　processing　systems,　the　single　crystal　of　strontium　titanate　surface　was　etched　to　be　the　surface　with　neatly　arranged　periodic　trench　structure,　and　as　a　result,　the　invasive　of　the　surface　turns　to　be　more　hydrophilic.　The　effect　of　groove　spacing　on　the　size　of　the　surface　contact　angle　is　studied.　Results　show　that　the　size　of　the　contact　angle　changes　with　groove　spacing,　namely,　the　groove　spacing　is　greater,　the　contact　angle　is　larger.　When　the　groove　spacing　is　less　than　150　μm,　the　surface　becomes　super　hydrophilic　surfaces.　Its　mechanism　is　that　according　to　the　Wenzel　model,　increasing　the　surface　roughness　can　make　the　invasive　of　the　surface　be　more　hydrophilic.　The　groove　structure　produced　siphon　phenomenon　also　enhances　the　hydrophilicity.