The invention provides a pulling cable corrosion sensor based on a resistance method, which can accurately monitor the corrosion state of a pulling cable. The sensor comprises a sealed C-shaped resinshell, two resistance probes, a power supply device, a high-sensitivity resistance measuring device, a wireless transmitting device and a wireless receiving device. The corrosion sensor is placed in acable sleeve at the anchoring end of the pulling cable; the high-sensitivity resistance measuring device in the sensor is set to periodically measure the resistance of the two resistance probes through a program; resistance information after measurement is sent out through the wireless transmitting device, and is transmitted to the wireless receiving device placed outside the cable sleeve in an anchoring area; and resistance data at the wireless receiving device is collected, then the data is processed through a computer, and the corrosion state of the pulling cable can be quantitatively judged through a resistance increment, so that corrosion monitoring is realized.