Underground wireless transmission adaptive frequency selection method and system

The invention relates to the technical field of underground signal transmission, in particular to an underground wireless transmission self-adaptive frequency selection method and system, and the system comprises a signal generation module, a frequency selection transmission module and an iterative algorithm module, wherein the signal generation module is used for generating a double-frequency signal according to a center frequency and a frequency iteration step length; the frequency selection transmitting module is used for performing frequency division self-checking processing on the double-frequency signal; the iterative algorithm module is used for selecting the frequency corresponding to the signal with the small amplitude after frequency division self-checking processing in the double-frequency signals as the center frequency to carry out frequency iteration, and the frequency iteration step length is gradually reduced in each time of frequency iteration until the frequency iteration step length corresp