Silencer suitable for high-speed wind tunnel stable section

The invention discloses a silencer suitable for a high-speed wind tunnel stable section. The silencer comprises a plurality of single-piece silencers arranged side by side. Each single silencer comprises a first part, a second part and a third part which are connected in sequence, and the second part comprises a skin, a plurality of partition plates, a plurality of resonant cavities formed by the skin and the partition plates, a silencing structure, a plurality of small holes in the surface of the skin and a resonator; the plurality of partition plates comprise a first partition plate and a second partition plate; the plurality of resonant cavities comprise a first rectangular resonant cavity formed by folding the skin, a second rectangular resonant cavity and a triangular resonant cavity formed by arranging the second partition plate at the diagonal position of the second rectangular resonant cavity; the silencing structure is arranged on the second partition plate and used for absorbing noise; and the reson