Photocatalytic　removal　of　nitrate　in　wastewater　has　attracted　wide　attention　because　of　its　simple　operation　and　environmental　protection.　However,　the　preparation　of　photocatalysts　with　high　efficiency　and　high　nitrogen　selectivity　is　still　a　challenge.　In　this　paper,　TiO2　is　grown　in　situ　on　Ti3C2　MXene　by　a　simple　calcination　method　and　modified　with　silver　particles.　The　presence　of　Ti3C2　reduces　the　recombination　rate　of　photogenerated　electrons　and　generates　more　photogenerated　electrons.　At　the　same　time,　the　silver　particles　also　increase　the　photoelectron　density　and　further　improve　the　carrier　separation　of　the　catalyst.　Due　to　its　unique　structure　and　optical　properties,　the　prepared　photocatalyst　shows　an　excellent　nitrate　removal　rate　under　a　high-pressure　mercury　lamp.　At　500　mg(N)/L,　the　nitrate　removal　rate　reaches　96.1%,　and　the　nitrogen　selectivity　reaches　92.6%.　Even　after　5　cycles,　the　prepared　photocatalyst　still　maintains　a　high　nitrate　photocatalytic　removal　efficiency　(89%).　The　electron　transfer　path　is　verified　by　density　functional　theory　calculations.