The flow field structure of bipolar plates in the flow battery is one of the key problems affecting the performance of the stack and the system, and the electrode is the main factor affecting the flow characteristics of electrolyte in the stack. In order to study the flow state of electrolyte in the flow battery, make the electrolyte more uniform and have higher mass transfer efficiency, this paper designed and built a carbon cloth permeability test platform for the flow battery, tested and calculated the viscous resistance coefficient and inertial resistance coefficient in the porous medium model and other key computational fluid dynamics data. Combining the key data obtained from the test with the numerical simulation, the flow state of electrolyte in the interdigital flow field structure was calculated under the compression conditions of 0.3, 0.4 and 0.5 mm of carbon cloth. It can be seen from the test and simulation results that the flow resistance of single battery increases sharply with the increase of carbon cloth compression. Therefore, it should be considered in the design of the stack to reduce the electrode compression as much as possible while ensuring the electrochemical performance, so as to improve the efficiency of the energy storage system. Through the research method of combining experiment and simulation, the existing stack design scheme can be evaluated and analyzed, and the design scheme can be fed back and revised.