Concrete chloride ion sensor and detection method

The invention discloses a concrete chloride ion sensor and a detection method.The concrete chloride ion sensor comprises a detection mechanism, an energy supply mechanism and a controller, the controller is connected with the detection mechanism and the energy supply mechanism, and the energy supply mechanism comprises a metal sheet and an energy storage capacitor; the metal sheet serves as a positive electrode and a negative electrode of the energy supply mechanism and is connected with the controller and the energy storage capacitor, the concrete chloride ion sensor is fixed to a steel bar of a to-be-constructed part, poured slurry reacts with the metal sheet to supply energy to the concrete chloride ion sensor, and the controller transmits detection data through the steel bar. A battery and an external power supply are not needed for power supply, current is generated by redox reaction of the metal sheet in the cement, and the defect of special power line connection is avoided; without a special lead-out w