A streaming connection management method and system are provided. In the streaming connection management method, a streaming source establishes a plurality of connecting requests through a first relay server, and the first relay server provides first streaming data. A number of connections established with the first relay server is determined. When the number of the connections established with the first relay server is greater than or equal to a first relay threshold of the first relay server, a data balance method is executed to obtain a second relay threshold. The first relay server is adjusted to provide a second streaming data, in which a pixel value of the first streaming data is greater than a pixel value of the second streaming data.