The invention provides an aluminum electrolytic cell technology multi-parameter online measuring device and a measuring method. The provided online measuring device comprises an online real-time and accurate anode busbar displacement measuring device, an online electrolytic cell inner chamber various technology parameter measuring device, a shell face heat preservation device and a control displaydevice. A method for measuring through the aluminum electrolytic cell technology multi-parameter online measuring device includes an anode busbar measuring part and an electrolytic cell inner chambermeasuring part, full-automatic measuring is accurately conducted on the electrolyte temperature, the electrolyte primary crystal temperature, the electrolyte equal-distance pressure drop, the electrolyte height, the aluminum water height, the electrolytic cell furnace bottom pressure drop, the anode position and the anode displacement through online measuring, a reliable and accurate number basisis provided for electrolytic aluminum production, and accordingly accurate control over an electrolytic cell is achieved.