As a high added value and high benefit industry，high-tech industry is an important component and main power to promote high quality economic development. Based on the data of Beijing，Tianjin and Hebei provinces from 2011 to 2019，this paper constructs the panel data model of high-tech industry agglomeration and regional industrial competitiveness，then analyzes the relationship between them，the results show that there is an inverted U-shaped non-linear relationship between the degree of agglomeration of the high-tech and regional competitiveness. At the same time，high-tech industry agglomeration can enhance regional competitiveness through knowledge spillover effect，scale economy effect and various cooperation mechanisms strengthening effect.