A data transmission method and a related apparatus are disclosed. The method is performed by a local MBMS functional entity, and includes obtaining local MBMS bearer information by using an interface between the local MBMS functional entity and an MBMS functional entity in a core network, after receiving application layer data sent by a local application server, determining a local MBMS bearer information matching the application layer data, and sending the application layer data based on the local MBMS bearer information matching the application layer data.