The invention discloses an intelligent anti-corrosion protecting and monitoring system of a grounding network. A positive electrode of a direct-current power supply is electrically connected with an auxiliary anode; a negative electrode of the direct-current power supply is electrically connected with a metal component of the grounding network; the direct-current power supply receives a control instruction of a PLC (programmable logic controller); a negative electrode of a micro-voltage meter is electrically connected with the metal component; an anode of the micro-voltage meter is electrically connected with a reference electrode; signals acquired by the micro-voltage meter are transmitted to the PLC; signals acquired by a temperature sensor and a humidity sensor are transmitted to the PLC; an impedance measuring device comprises a current measuring end and a voltage measuring end; the current measuring end is electrically connected with a signal source; the signal source is electrically connected with a sample; a current-limiting resistor is in series connected between the signal source and the negative electrode of the sample; the voltage measuring end is electrically connected with the sample; and the impedance measuring device is used for transmitting the acquired signals to the PLC. The purpose of effectively protecting the grounding network is achieved.