Entrepreneurial activities can stimulate the vitality of the market economy, promote the flow of production factors and the adjustment of industrial structure, and play an important role in the economic and social development of a country or region. However, the social capital of the entrepreneur is very important for the new venture to break through the congenital defect and industry barrier and get the chance of growth. 
 The quantity and quality of social capital owned by entrepreneurs can promote the growth of start-ups, and it can also promote the growth of enterprises after improving the effect of identifying growth opportunities. This paper focuses on the relationship between the social capital of entrepreneurs and the growth of New Ventures and analyzes the relationship between the social capital of entrepreneurs, the recognition of growth opportunities, and the growth of new ventures with the growth opportunity as the intermediary variable, this paper analyzes the mechanism of the influence of entrepreneur social capital on the growth of new ventures, and constructs the theoretical model of “Entrepreneur social capital-recognition of growth opportunity-growth of new ventures”, this study considers the moderating effect of business environment dynamics on Growth Opportunity Identification and start-up growth. Through the test, we draw the following conclusions: first, the social capital of entrepreneurs has a positive impact on the growth of new ventures; second, the social capital of entrepreneurs has a positive impact on the identification of growth opportunities; Third, the growth opportunity recognition plays an intermediary role in the entrepreneur social capital to the new venture growth; fourth, the dynamic business environment plays a moderating role in the growth opportunity recognition and the new venture growth.