The invention discloses a thermal management monitoring device which is mounted at an inlet-outlet position of a water cooling pipe of a water cooling structure battery pack A or at one side, close toan evaporation pipe, of a direct cooling structure condensing pipe and a capillary pipe and used for providing the real-time accurate flow pressure difference, temperature and other base data for thermal management of the battery pack A so as to comprehensively calculate a working state of a battery pack A thermal management system; on the basis, the thermal balance circulation state of the thermal management system is judged, and an alarm function to failure is achieved. At the same time, the recorded data provide an effective reference for research and development type experiments. The efficient and convenient monitoring device is provided for thermal management of the battery pack A, the thermal management structure is simplified to a certain extent, and the security is strengthened.