The invention discloses an ultra-thin Schroeder diffuser, which comprises a backing-plate, wherein the backing-plate is provided with 7 × p rows and 7 × q columns of unit cells, p and q are integers greater than or equal to 1, a side length of the unit cell is 0.48 » , a depth of the square unit cell is 0.04 » , the unit cell is provided with a square neck, a side length of the square neck is less than the side length of the unit cell, a depth of the neck is 0.01 » , » is a wavelength of the diffuser corresponding to the design at a center frequency center f 0 , the neck widths w of different unit cells are different, and a distribution of the widths satisfies a certain sequence. The invention can implement broadband sound wave diffuse reflection, has a comparable performance of diffuse reflection to the conventional Schroeder diffusers, and can reduce a material thickness in the meanwhile; the thickness of the invention is » /20 only in comparison to a conventional Schroeder thickness » /2, which is convenient to use in practice.
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