A　single-wire　cutting　experiment　on　the　polycrystalline　diamond　by　UV　nanosecond　laser　was　carried　out.　The　result　was　characterized　and　analyzed　by　the　scanning　electron　microscope　and　XPS　energy　spectrum　analysis.　It　found　that　the　width　and　depth　of　grooves　continue　to　increase　with　the　increasing　of　laser　power,　scanning　times,　and　the　decreasing　of　scanning　speed.　A　finer　groove　with　a　narrower　width　and　deeper　depth　can　be　obtained　by　adjusting　the　focus　point　on　the　surface　of　the　PCD　material.　XPS　spectrum　of　C1s　indicated　that　sp(3)　structure　converts　to　the　sp(2)　graphite　phase　and　removed　by　photochemical　mechanism　when　the　UV　nanosecond　laser　irradiates　the　PCD.　Moreover,　the　cutting　result　suggests　that　UV　nanosecond　laser　can　achieve　finer　processing　of　PCD　material.