A fountain code-based cooperative multicast method comprises: 1) transmitting forwards, by a base station, a code symbol informed by a packet encoded by a fountain code, after receiving a feedback that all users correctly decode, stopping transmitting a data; 2) after completing receiving the data early by a user with good channel conditions, monitoring a “help” signal of other users, when receiving the “help” signal, the user with good channel conditions participates in a cooperation, when receiving the feedback of a cooperative user that has correctly received the data, stopping the cooperation by the user with good channel conditions; and 3) monitoring a feedback signal of remaining users that correctly receive the data by a user that does not complete receiving the data, and deciding whether to transmit a “help” signal, according to a signal intensity of the feedback signal.