Using panel data of Chinese listed firms from 2011 to 2023, this study examines the effects of digital technology innovation and its spillovers on enterprise new quality productivity and the underlying mechanisms. The findings reveal that both digital technology innovation and its spillovers significantly increase enterprise new quality productivity. Mechanism tests show digital technology innovation drives short-term leaps by enhancing absorptive capacity, reconfiguring factors of production and promoting green development, while technology spillover sustains long-term growth via data element scale and data right multiplier. Technology spillover positively moderates the incentive effect of digital technology innovation, especially for R&D-alliance and high-user-interaction firms, low-data-monopoly and digital-tech sectors, and open-data or strong-institution regions.