To clarify the impact mechanism of technology innovation on water use efficiency, a spatial econometric model was used to construct the impact effect model and contribution model of technology innovation level on water use efficiency.Based on panel data from 2009 to 2021, the technology innovation index and water use efficiency index in the Beijing-Tianjin- Hebei Region were calculated, and the elasticity coefficient and contribution rate of the technology innovation level to water use efficiency in the Beijing-Tianjin-Hebei Region were evaluated.The results indicate that the technology innovation index and water use efficiency index in the Beijing-Tianjin-Hebei Region show a stable growth trend, and both are evolve in the same direction.The impact of technology innovation level on water use efficiency in the Beijing-Tianjin-Hebei Region is positively significant and there are spatial differences. For every 1% increase in technology innovation level in Beijing, Tianjin, and Hebei, water use efficiency increases by 2.684%, 0.918%, and 1.365%, respectively. The contribution rates of technology innovation level to water use efficiency in Beijing, Tianjin, and Hebei are 50.47%, 45.74%, and 62.59%, respectively. The contribution rate of technology innovation level to water use efficiency in the Beijing-Tianjin-Hebei Region from 2009 to 2021 shows a segmented fluctuation pattern influenced by technological iteration, policy issuance, and water use structure optimization.