The power space of urban agglomeration is the status of individual cities in a regional spatial network, and the control scope and degree of control of individual cities within the region are quantified based on the associated network. According to the theory of power space and space production, crawled directory data of financial enterprise headquarters and their branches in the Yangtze River Delta region are used to construct spatial attribute database through ArcGIS and UCINET, and the power space structure of urban agglomeration by network analysis method. The results showed that: (1) The control index of Shanghai reached 120.72, and the remaining 25 cities showed less than 50 except Nanjing; the central index of Shanghai reached 0.263 2, and Nanjing, Hangzhou and Hefei were 0.132 4, 0.098 8 and 0.044 1, respectively. The gap in power space between cities is significant, completely forming a “central-edge” power space structure and presenting a polarization trend. (2) The Condensed-Subgroups of the power space are clearly defined: the correlation strength between Zhejiang, Anhui provinces and Jiangsu Province is lower than 100 and 200, respectively, while the correlation strength between Shanghai and region of “SouthJiangsu Province” is close to 400. (3) The significant difference between centrality, control power and cohesive subgroups indicates that the spatial pattern of urban power is a non-equilibrium form under the flow of capital elements, and also an important result of the production of material and institutional space. The above reveals that in the process of spatial production of urban agglomerations, the city interacts as a power subject at the moment, and the profitseeking tendency of financial capital further expands the differences in urban power in the network.