As the economy transitions from high-speed growth to high-quality development, regional economic coordination has become an important strategic opportunity. This paper takes the coordinated development of the urban economies in the Beijing-Tianjin-Hebei region as its backdrop. Based on the calculation of the coordinated development level of the urban economies in the Beijing-Tianjin-Hebei region using a composite system coordination model, the paper constructs a spatial panel model to empirically analyze the impact of selected influencing factors on their coordinated economic development and explores the coordinated development mechanism of the urban economies in the Beijing-Tianjin-Hebei region. The study found that from 2015 to 2024, the economic development level of the Beijing-Tianjin-Hebei region continued to rise, but its economic coordination level remained low, ranging from 0.091 to 0.376, indicating a state of low to moderate coordination. The economic coordination of cities in the Beijing-Tianjin-Hebei region is primarily positively and significantly influenced by the degree of marketization, level of openness to the outside world, government intervention, and regional economic development level (p < 0.1), while population density (-0.423) and transportation density (-0.012) have a negative impact on their coordinated economic development. The Beijing-Tianjin-Hebei region should adopt collaborative strategies such as leveraging comparative advantages, defining functional roles, developing industrial chains, and strengthening inter-regional interactions to promote the coordinated economic development of cities in the region.