A method for manufacturing an acoustic attenuation panel of a ceramic matrix composite comprises the following steps: coating a mold with a plurality of folds made of a fiber reinforcement comprising fibers of the ceramic material defining the first skin of the acoustic attenuation panel. b. Deposition of a plurality of blocks (21) on the first skin;The first material, the so-called escape material, defines at least one space (E) between two blocks, A plurality of folds made of a fiber reinforced material containing ceramic material fibers are coated on the surface composed of blocks to define a second skin ((27) of an acoustic attenuation panel through which the ceramic phase precursor passes through a liquid medium ((19, 19, 19, 19, 19, 20) In at least one space (E) separating the dispersive material block, the liquid medium is removed from the liquid medium by evaporation or polymerization, and the assembly is sintered by F.At the temperature of strengthening the ceramic material and removing the escaping material.
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