This application discloses a carrier selection method and a communications device. The method includes: obtaining channel busy ratios (CBRs) of a plurality of candidate carriers and selecting, when a value of a resource reselection counter C_resel is equal to 0, a carrier from the plurality of candidate carriers according to the CBRs of the plurality of candidate carriers. Therefore, the carrier is selected from the plurality of candidate carriers according to the CBRs of the plurality of candidate carriers, thereby reducing carrier switching frequency and ensuring system stability while the carrier is selected.