The invention relates to a play delay time regulating method for a network point-to-point streaming system and a device thereof; the regulating method comprises the following steps: the integrity of a packet saved in a data exchange buffer area is dynamically determined and updated according to the packet saved in the data exchange buffer area of a network node; if the integrity of the packet is higher than the integrity of the packet before updating, the play delay time of the network node is reduced; if the integrity of the packet is lower than the integrity of the packet before updating, the play delay time is increased.