The invention provides a transmitting end, a terminal, a system and a method for multiplexing of hierarchical coding. The method comprises the following steps of: dividing a traffic channel into a plurality of channels different in reliability; encoding data of a service into M levels; encapsulating M levels of the data into N different multiplex sub-frames; and encapsulating the N multiplex sub-frames on L different reliable channels and then transmitting the N multiplex sub-frames, wherein the M, the N and the L are natural numbers which are greater than 1. By adopting the technical scheme, hierarchical coding audio-video data are carried by multiplex frames, and hierarchical coding data different in importance are transmitted in physical channels different in reliability, so that the receiving reliability of the terminal is improved, and the most basic service can be received when the signal is poor.