Expanding the scale of the technology market plays an important role in improving the quality of agricultural technical innovation. It took the period from 2004 to 2020 as the research period， and used machine learning and text analysis methods to calculate the quality of agricultural technical innovation in various provinces （cities， autonomous regions）. On this basis， empirical analysis was conducted to examine the effect of technology market scale on the quality of agricultural technical innovation， and a mediation effect model was constructed to figure out its internal transmission mechanism. The results show that technology market scale has a significant positive influence on the quality of agricultural technical innovation， and such influence is stronger in the central and eastern regions， while relatively weaker in the western regions. Technology market scale positively encourages the improvement of the quality of agricultural technical innovation through knowledge spillover and collaborative innovation effects. The mediating effect of knowledge spillover is stronger than collaborative innovation. The research conclusion provides empirical evidence for further clarifying the mechanism by which technology market scale affects the quality of agricultural technical innovation， and provides a new perspective and path for improving the quality of agricultural technical innovation.