The invention relates to the technical field of noise tests, in particular to an elastic supporting device. The elastic supporting device comprises an air compressor, wherein the air outlet of the aircompressor is fixedly connected with a left air pipe, the right end of the left air pipe is fixedly connected with a pressure reducing valve, and the portion, located on the right side of the air compressor, of the bottom of the pressure reducing valve is fixedly connected with a fixing frame; the right side of the pressure reducing valve is fixedly connected with the right air pipe; and the right side of the fixing frame is provided with a rigid supporting base, wherein the top of the rigid supporting base is fixedly connected with a lower switching frame. According to the elastic supportingdevice, the rigid supporting frame, the air compressor, air springs, the left air pipe and the right air pipe are arranged, so that the problem that in a current noise test, a tested product needs tobe elastically supported so that free-free boundary conditions of the tested product in a flying state can be simulated, namely, the supporting frequency of the tested product is smaller than 1/4 ofthe starting frequency of the test, but through a traditional rubber pad supporting mode, it is difficult for the supporting frequency to drop to 10 Hz or below, which leads to inaccuracy in experimental data can be solved.