Data frame group broadcasting duplicating method and system

The invention is suitable to DSLAM, Ethernet exchange, and router etc. digital exchange equipment in digital communication area. The invention carries out following operations: reading multicast forwarding commands of data frame; picking up port forwarding list, and frame control block; carrying out reproductive enqueue processes including three procedures: looking up forwarding port, checking enqueue admittance and enqueue of frame control block for the said frame control block, till the said frame control blocks in queues of all forwarding ports in the port forwarding list are replicated in enqueue; then, reading out next forwarding command to carry out multicast replicated in enqueue of next frame control block; the said three procedures are processed in mode of independent in multiple stages and in parallel. The invention raises efficiency of replicating multicast of data frame, solves bottleneck in multicast replication may caused by DSLAM, Ethernet exchange, and router etc.