The invention provides a streaming media file processing system and a streaming media file processing method, wherein the streaming media file processing system comprises the components of a slice server, a service middle member and at least one streamer server. The slicer server receives a target streaming media file and performs decoding on the target streaming media file for obtaining at least two slice files. A program multicast flow table is formed according to a decoding time point which corresponds with each slice file. At least two slice files and the program multicast flow table are transmitted to the service middle member. When the service middle member receives at least two slice files and the program multicast flow table, the service middle member transmits a searching instruction to each streamer server. The streamer server reads at least two slice files and the program multicast flow table from the service middle member in receiving the searching instruction which is transmitted from the service middle member. Through the streaming media file processing system and the streaming media file processing method, the streamer server can acquire a plurality of slice files of the streaming media file in time.