The invention provides a method for transmitting voice data stream and equipment thereof, wherein, the method comprises the following steps: after transmission equipment receives the voice data stream by a first Voice VLAN, if the condition that the first Voice VLAN is replaced by a second Voice VLAN is satisfied according to the advance collocation or the actual network requirement, a first Voice VLAN identification carried in the voice data stream is replaced by a second Voice VLAN identification, and the voice data stream is transmitted continually by the second Voice VLAN. The method can bring great convenience to network update, and the VLAN sources can be utilized more economically and reasonably.