The Noisy Great Reed Warbler is similar to the Great Reed Warbler. It often moves alone or in pairs. It is agile and quick, often dodging and darting quickly through reeds, bushes or grass. During the breeding season, it often stands on the top of reeds or other aquatic plants and shrubs and sings for a long time, especially in the early morning and evening. It likes to stand on the top of reeds and sing. When seeing people approaching, it immediately falls into the grass, and later secretly jumps to the top along the reed stems. If the person has gone away, it will continue to sing. When warning, it makes a hoarse "chack" or "churr" sound; the sound is sweet, interspersed with higher and sharp rattles and characteristic "ro-do-peck-kiss" phrases. The voice is more pleasant and less hoarse than that of the Great Reed Warbler; it usually sings at night.
Feeds mainly on insects and their larvae, and also eats small frogs and invertebrates such as crustaceans.
The breeding season is from May to August. The nest is built in reeds or water grass near water or water. The nest is mostly built on 3-4 strong and upright living reed stems tied together. The nest is made entirely of reeds and is generally 30-60 cm above the water or ground. The nest is deep cup-shaped, with an outer diameter of 15 cm and an inner diameter of 7.5 cm. The nest is built by the female bird, and the male bird sings nearby. Each nest lays 3-6 eggs, mostly 4-5. The eggs are pale white or greenish white, with brown, black and lavender gray spots of different shades. The egg size is 18.3-21.4 mm × 14.1-16.0 mm. The parents take turns to incubate the eggs, and the incubation period is 14-15 days. Both parents raise the chicks together.
Listed in the "Red List of Threatened Species of the World Conservation Union" (IUCN) 2017 ver 3.1-Least Concern (LC).