Provided are a packet conversion method and device. The method comprises: receiving a first packet, wherein the first packet complies with an SRIO protocol, a data load domain of the first packet comprises data, the first packet contains a source device ID number, a destination device ID number and package distribution information, and the package distribution information comprises a source transceiving thread and a destination transceiving thread; and acquiring a second packet according to the first packet, wherein the second packet comprises an Ethernet packet header, an IP packet header, a transmission layer protocol packet header and a data field, the Ethernet packet header comprises a source MAC address corresponding to the source device ID number and a destination MAC address corresponding to the destination device ID number, the IP packet header comprises a source IP address corresponding to the source device ID number and a destination IP address corresponding to the target device ID number, the transmission layer protocol packet header comprises a source port number corresponding to the source transceiving thread and a destination port number corresponding to the destination transceiving thread, and the data field comprises the data.