Sending method and receiving method of multicast data

The invention discloses a sending method and a receiving method of multicast data. The sending method includes the steps that the multicast data needing sending are separated into multiple multicast packets; parameter information is added to a packet header of each multicast packet, and the parameter information is used for showing the position of the current multicast packet in the multicast data; multicast sending is performed on the multicast packets after the parameter information is added to the multicast packets. According to the sending method and the receiving method of the multicast data, by separating the multicast data, sending the separated multicast packets to provide an efficient multicast communication mechanism and shortening data time delay and by adding the packet headers which are used for determining the position of each multicast packet in the multicast data on the separated multicast packets, integrity and orderliness in sending the multicast packets are facilitated, and the communication efficiency is further improved.