The invention discloses a power line channel communication resource allocation method based on the minimum required rates of users. The reachable transmission rates of UE on subcarrier channels are determined; the subcarrier channels are sorted according to the attenuations of all subcarrier channels; an unoccupied optimum subcarrier channel is allocated to each piece of UE according to an instantaneous rate maximization rule; then the priorities of all pieces of UE are determined according to the minimum required rates of the UE; one piece of optimum UE is selected out; a surplus subcarrier channel is allocated to the optimum UE; the optimum UE is selected out repeatedly; the surplus subcarrier channel is allocated to the optimum UE until all the subcarrier channels are allocated completely. According to the method, the system channel resources can be utilized maximumly; the system transmission efficiency is improved; the system throughput is ensured to be maximized; and moreover the fairness of the users is taken into consideration.