Low-temperature liquid flow performance testing system and testing method thereof

The invention relates to the technical field of flow instrument verification, and provides a low-temperature liquid flow performance test system and a test method thereof. The low-temperature liquid flow performance testing system comprises a weighing device, the weighing device comprises a container, a first pipeline, a second pipeline, a weighing device and a jacking mechanism, one end of the first pipeline is communicated with the container, and the other end of the first pipeline is connected with an automatic butt joint; one end of the second pipeline is communicated with the first pipeline through an automatic butt joint; the weighing device is arranged below the container; the jacking mechanism is used for driving the container to be close to or away from the weighing device in the vertical direction. The automatic butt joint and the jacking mechanism are additionally arranged in the weighing device, rapid connection or disconnection and separation of the first pipeline and the second pipeline can be a