Using　panel　data　from　Chinese　A-share　listed　enterprises　from　2013　to　2021,　this　study　employs　the　difference-in-difference　model　to　examine　the　impact　of　water　resource　tax　reform　on　corporate　green　technology　innovation.　The　results　demonstrate　that　the　water　resource　tax　reform　significantly　promotes　corporate　green　technology　innovation.　Further　analysis　reveals　that　water　resource　tax　reform　can　positively　impact　green　technology　innovation　of　enterprises　in　high-water-consuming　industries　and　those　with　a　strong　sense　of　environmental　responsibility.　This　study　examines　the　impact　of　water　resource　tax　reform　on　green　technology　innovation　at　the　micro　level.　The　conclusions　are　of　practical　significance　for　promoting　the　improvement　and　sustainable　implementation　of　water　resource　tax　reform.　©　The　Author(s),　under　exclusive　licence　to　Springer　Science+Business　Media,　LLC,　part　of　Springer　Nature　2024.