The embodiment of the invention provides a multi-business unified crossing method and a device. The method comprises the steps of obtaining and reporting a bandwidth request message of a local branch interface to a network host, wherein the bandwidth allocation information comprises a bandwidth map and multicast/broadcast control information; filtering T-CONT frames according to the instruction of the bandwidth map; carrying out crossing treatment on the T-CONT frames which need to be processed by a local node after filtration according to the multicast/broadcast control information, and caching the T-CONT frames after the crossing treatment; reconstructing the cached T-CONT frames to TC frames according to time slot positions of all the T-CONT frames in the TC frames instructed in the bandwidth map, then sending the TC frames to a circuit unit through a circuit interface, and sending the T-CONT frames which need the local downlink to a branch unit through a branch interface. The method can realize a time slot-based multi-business unified crossing plane, be simple to realize and meet dynamic bandwidth adjustment and service quality demands when carrying data business.