Optimizing　photocatalytic　CO2　reduction　with　simultaneous　pollutant　degradation　is　highly　desired.　However,　the　photocatalytic　efficiency　is　restricted　by　the　unmatched　redox　ability,　high　carriers＇　recombination　rate,　and　lack　of　reactive　sites　of　the　present　photocatalysts.　Herein,　the　CuInZnS-Ti3C2Tx　hybrid　with　matched　redox　ability　and　suitable　CO2　adsorption　property　was　rationally　synthesized.　The　nucleation　and　growth　process　of　CuInZnS　was　interfered　by　the　addition　of　Ti3C2Tx　with　a　negative　charge,　resulting　in　thinner　nanosheets　and　richer　reactive　sites.　Besides,　the　Schottky　heterojunction　built　in　the　hybrid　simultaneously　improved　the　photoexcited　charge　transfer　property,　sunlight　absorption　range,　and　CO2　adsorption　ability.　Consequently,　upon　exposure　to　sunlight,　CuInZnS-Ti3C2Tx　exhibited　an　efficient　photocatalytic　CO2　reduction　performance　(10.2　mu　mol　center　dot　h(-1)center　dot　g(-1))　with　synergetic　tetracycline　degradation,　obviously　higher　than　that　of　pure　CuInZnS.　Based　on　the　combination　of　theoretical　calculation　and　experimental　characterization,　the　photocatalytic　mechanism　was　investigated　comprehensively.　This　work　offers　a　reference　for　the　remission　of　worldwide　energy　shortage　and　environmental　pollution　problems.