The invention discloses a monitoring alarm system and a monitoring alarm method. The method comprises the following steps of: setting multi-level monitoring subsystems as sub nodes according to administrative jurisdiction, wherein each level defines different function according to the responsibility and corresponds to different equipment; dividing data stream into media stream and alarm information stream; transmitting the media stream and the alarm information stream by adopting independent data channels respectively; and transmitting the data stream by adopting a quality of service (QoS) control mode of an application layer, wherein the alarm information stream is distributed with the highest QoS priority to ensure that the alarm information stream is distributed to the set sub nodes inshortest delay time. According to the technical scheme, alarm of multi-level mode can be realized, and alarm response is quicker.