A data stream and data packet transmission method and device are described, relating to the field of interface data transmission technologies. The method includes: a home end detects whether data to be transmitted is a data stream or a data packet; when it is detected that the data stream and the data packet exist simultaneously, the data stream is preferentially transmitted; and upon completion of transmission of the data stream, then the data packet is transmitted. According to the embodiments of the disclosure, when the data stream and the data packet exist simultaneously, high efficiency transmission of the data stream may be achieved with no need of extra external time for scheduling operations, effectiveness of transmission of the data stream is enhanced, and data transmission efficiency through the interface is improved.