The influence of the nontimber forest products (NTFPs) on the coordinated economic and ecological development has received considerable attention, where the results are mixed. This study took Lin’an District in Zhejiang Province of China as an example for analysis. Using long-term (more than 40 years) data, system coupling and autoregressive distributed lag models were combined to analyze the effect of NTFP development on coordinated economic–ecological development. The results show that large-scale commercial NTFP development positively affected coordinated economic–ecological development, and a long-term stable equilibrium relationship between them existed. The degree of regional economic–ecological coupling increased from 0.05 in 1978 to 0.98 in 2019, and both area and value of NTFP had a significant effect on the coupling degree at the 5% level. These findings indicate that NTFP development is an effective method to promote the coordinated development of the economy and ecological environment especially in mountain areas, and the government should encourage NTFP development by ecological management, strengthening policy guidance, and providing technological innovation support, etc.