The invention discloses a rubber extruded product electrical conductivity online detection device and method. Rubber extruded products moving continuously are connected to a resistance measurement unit through conducting electrodes, the electrical conductivity of the moving rubber extruded products in the continuous production process is detected out through an electrical conductivity judgement unit, a control signal conversion unit, a PLC control system and a human-computer interface system, whether or not the electrical conductivity is qualified is judged automatically, a corresponding control signal is sent out according to the judgement result, audible and visual alarm and text message display is conducted, and real-time online monitoring on the electrical conductivity of the rubber extruded products is achieved. Accordingly, by conducting measuring, collecting, analyzing, judging and alarming on resistance of the rubber extruded products, quality monitoring of the electrical conductivity of the rubber extruded products is conducted continuously online in real time, and then continuity, accuracy and reliability of tire electrical conductivity quality control are guaranteed.