A multicast message replication method and apparatus are provided. The method includes: step 1. storing a received message in a message cache module, and an inter-port replication module acquiring a cache address of the message, inter-port replication information of the message, and inner-port replication information of the message, replicating the cache address according to the inter-port replication information, and transmitting the replicated cache address and the corresponding inner-port replication information to a port queue module to be stored; step 2. a port scheduling module scheduling the cache address of the port queue module, and under the scheduling by the port scheduling module, the port queue module outputting a cache address for which message replication needs to be performed according to the stored corresponding inner-port replication information; step 3. the message cache module reading a corresponding message according to the cache address output by the port queue module and outputting.