The device has a box main portion that is provided in the closed space of the micro-pump (2), and is provided with a water valve, a motor assembly, a water tank, a control system and an imaging system. The motor assembly is provided for realizing the connection and disconnection of the water valve. An imaging system is arranged at the outside of the bubble collector (6), for taking the profile of the air bubble from bubble collector. The control system is connected with the pump and is electrically connected with motor assembly and imaging system. USE - Bubble collecting and measuring device for water circulation system in microgravity environment. ADVANTAGE - The structure of the measuring device can be compact and the portability of the device can be increased. The power consumption of the device can be reduced and the security can be improved. DETAILED DESCRIPTION - The water tank is provided with an expansion tank (8) that is mutually connected a bubble collector which is provided with a water inlet and a water outlet. The water inlet and the water outlet are connected with pump through the pipeline.