A wide-band communication method with high anti-interference performance for a medium-voltage power distribution network underground power line aims to solve the problem that mutual interference is caused easily when a plurality of channels transmit different information, and is characterized by comprising the following steps: first, determining the wide-band communication frequency range of the medium-voltage power distribution network underground power line according to the transmission characteristic of the medium-voltage power distribution network underground power line; dividing the whole wide-band communication frequency range into several frequency bands according to channel attenuation conditions; and then, determining the modulation mode and the channel band width of each frequency band according to the channel attenuation condition and the transmission rate of the frequency band, so as to fulfill wide-band communication frequency distribution of the whole frequency range. The working frequency bands and the modulation modes of the wide-band communication of the medium-voltage power distribution network underground power line are designed reasonably, so that the problem that mutual interference is caused easily when the channels transmit different information is well solved; and wide-band communication resource of the power line is distributed reasonably, so that data transmission efficiency and reliability are improved.