The invention discloses an industrial capacitively coupled contactless conductivity online measurement device and method. The device comprises an alternating current excitation source, an insulated pipeline, an exciting electrode, a detection electrode, an inductance module, a metal shield, a metal isolation plate, a metal flange connecting part, a first wire connecting terminal, a second wire connecting terminal, a signal processing module, a data acquisition module and a computer. The invention realizes the conductivity online measurement on an industrial conventional metal pipeline throughthe capacitively coupled contactless conductivity measurement technology. By using the metal flange connecting part, the insulated pipeline of the device can be conveniently connected with the metal pipeline on an industrial site. Simultaneously, the measured pipeline and the electrodes are mounted in a metal shielding housing, thereby improving the stability and the anti-interference ability of the device. The corresponding device has the advantages of high resolution, simple structure, non-invasive operation, no impacts on fluid in the pipeline and the like, thereby providing a helpful reference for non-invasive online measurement of the conductivity of liquid in the process industrial conventional metal pipeline.