The invention discloses a method for transmitting MBMS business data, equipment and a communication system. The method for transmitting the MBMS business data comprises the steps of: detecting UE to be switched from an original cell to a target cell; obtaining a sequence A of a current data packet transmitted by the original cell and a sequence B of a current data packet transmitted by the target cell B; ensuring data packets to be compensated if the sequence B is larger than the sequence A; and transmitting the ensured data packets to be compensated. The embodiment of the invention solves the problem that some data packets are not received as the receiving time of the data packets are lost after the UE is switched to the target cell with the faster transmission progress than the original cell in the prior art, thereby reducing the lost data quantity of the UE and improving the reliability of the network.