The invention discloses a multimedia resource adaptive synchronization method in a heterogeneous network based on network conditions, and the method comprises the steps that 1, a server obtains the time delay of broadband networks where different users are located and the usable bandwidth information; 2, the server calculates a moment when multimedia resources can be represented synchronously according to the time delay of broadband networks where different users are located and the usable bandwidth information after a user request is received; 3, the server transmits the multimedia resourcesat the moment when multimedia resources can be represented synchronously, reminds a client of the playing start time of the multimedia resources, and enables the broadband contents of different usersto be represented synchronously. The method solves a problem that different network conditions in the heterogeneous network transmission cause the asynchronization of broadcast and media resources ofbroadband users.