Capillary flow resistance measuring system

The utility model relates to the technical field of capillary tubes, and provides a capillary tube flow resistance measuring system which comprises a Dewar flask, a liquid storage tank, a pump, a mass flow meter and a communicating pipeline, the Dewar flask is provided with an inner cavity, the liquid storage tank is used for storing a liquid refrigerating medium and communicates with the inner cavity, the communicating pipeline is detachably connected with the Dewar flask, and the pump is connected with the Dewar flask. A first port of the communicating pipeline extends into the inner cavity, the first port is used for being communicated with the capillary tube, and the pump and the mass flow meter are both arranged on the communicating pipeline and located outside the Dewar. According to the invention, the problems that the flow resistance of the capillary tube is influenced by the temperature and the type of the refrigerating medium, and the measurement precision is low when the flow resistance of the capi