The long-term impact of educational opportunity inequality on economic growth has long been a focus. This paper investigates the correlation between educational opportunity inequality and economic growth in Shandong from 2013 to 2021. The ratio of middle schools to students is designated as the independent variable for each city, and the GDP per capita is designated as the dependent variable. Both the Gini index method and the correlation analysis are applied. The study's findings show that the trend in educational opportunity inequality has been increasing, decreasing, and then increasing overall, while the trend in the disparity between economic development has been decreasing, increasing, and then decreasing. The correlation between the two Gini indexes is negative. The educational and political factors contributing to the negative correlation are further analyzed.