Flowmeter precision detection device and detection method

The invention relates to a flowmeter accuracy detection device and method, the flowmeter accuracy detection device comprises a box body capable of containing liquid to be detected, and further comprises a detection pipeline, a purification pipeline, a conductivity detection mechanism and a flow detection mechanism, the purification pipeline is provided with a first stop valve and a purifier capable of reducing the conductivity of the liquid, and the purification pipeline is provided with a second stop valve; liquid flows back into the box body through the purification pipeline, the detection pipeline comprises a detection section used for installing a flowmeter, a liquid outlet pipe is arranged at the tail end of the detection pipeline, a pipe opening of the liquid outlet pipe faces an inner cavity of the box body, and the conductivity detection mechanism is used for detecting the conductivity of the liquid in the box body. And the flow detection mechanism can be used for draining from the liquid outlet pipe