The utility model discloses a material sound -absorption capacity testing arrangement based on schlieren method, include laser instrument, acoustic generator, collector lens, open the light screen, incident light collimating mirror, output optical alignment mirror, blade and the camera that have the slit, the focal plane of incident light collimating mirror is arranged in to the slit of light screen, the blade is located between output optical alignment mirror and the camera, and the focal plane of output optical alignment mirror is arranged in at the blade edge. The utility model discloses anacoustic generator's effect makes the refracting index of air change, makes the light through the air turbulence district take place the skew, and the blade edge is used for blockking the light thatproduces the skew, makes it can't enter into the camera, can obtain the alternate stripe of light and shade on the image that the camera was gathered, through the ratio between the gray value of lightand shade stripe on the image, reachs the sound -absorption capacity of the material that awaits measuring, the realization visual test of material sound -absorption capacity high accuracy of awaiting measuring. The utility model is used for measuring material's sound -absorption capacity.