Data stream transmitting method and device

The application discloses a data stream transmitting method, and aims to provide a specific implementation way for power superposition non-orthogonal multiple access. The method comprises the following steps: when the total transmitting power of a transmitting end is greater than transmitting power needed for transmitting data streams to first equipment, modulating data to be transmitted to the first equipment and data to be transmitted to at least one piece of other equipment onto the same data stream; and transmitting the same data stream by adopting transmitting power determined specific to the first equipment and the at least one piece of other equipment. The application further discloses a data stream transmitting device.