The invention discloses a device and a method for multi-
metal component online polargrafic detection of complex feed liquid in the wet-process
metallurgy process and aims to provide an online polargrafic detection device for metallurgical industrial sites. The device comprises an automatic dropping-mercury quick lifting device, a
pressure difference liquid level measuring device, a spiral hose connector and an automatic cleaning detection tank. When the online polargrafic detection device and the online polargrafic detection method are used, a mercury storage
bottle can be lifted / dropped quickly, accurately and stably to ensure that the height of a liquid level, which is lifted every time, of a mercury surface of the mercury storage
bottle is consistent; the spiral hose connector is durable, and the detection tank can realize the automatic filling and cleaning of the feed liquid; the quick online automatic detection of multiple
metal components is realized, real-time and accurate information is provided for the optimization and control of the operating process, and the
energy conservation, consumption reduction and emission reduction in the wet-process
metallurgy process are promoted powerfully, so the online polargrafic detection device and the online polargrafic detection method have a great significance for the improvement of comprehensive
automation level of enterprise production and the enhancement of international competitive power.