The invention discloses a latticing tunnel real time continuously leading forecasting method and the device. It includes the following steps: adopting metal component locating outside tunnel, on tunnel inner wall or working face field to arrange infinite distance measuring electrode B, shield electrode A1 and main electrode A0, and using cable to connect host computer at locality; the host computer emitting homopolarity impulse current of different voltage and receiving electric signal of main electrode, after processing and A/D covert, the digital signal would be input to CPU of host computer; the CPU testing apparent resistivity and apparent induced polarization ratio of the target object; comparing the tested apparent resistivity and apparent induced polarization ratio with the preset value range, the target object would be identified and displayed and alarming.