Data transmission method, apparatus and system, for broadening MEC application scenarios, are disclosed, so service data cannot only be terminated at a local service platform, but also can be processed by the local service platform and then delivered to a remote service platform for processing; alternatively the service data is processed by the remote service platform and then delivered to the local service platform for processing. The data transmission method includes an MEC server determining, when receiving a service data packet sent by a local service server, a service data packet forwarding mode corresponding to the local service server according to a pre-set data forwarding information table; and the MEC server processing, according to the service data packet forwarding mode corresponding to the local service server, the service data packet by adopting a processing manner corresponding to the service data packet forwarding mode, and then sending the service data packet.