A service transmission method, a base station and a terminal are provided. The method includes: a base station sends a switch message of a narrow bandwidth receiving mode to a terminal, indicating the terminal to switch to a designated narrow bandwidth to receive information, wherein a width of the narrow bandwidth is smaller than a width of a system bandwidth; and when a pre-scheduled service needs to be transmitted, the base station schedules the terminal to switch to the system bandwidth or the bandwidth occupied by the pre-scheduled service to receive the pre-scheduled service.