The utility model provides a double-layer stereo noise-reducing protective screen comprising multiple crew-cut noise-absorbing wedges and a resonance soundproofing structure. The resonance soundproofing structure is composed of a stereo support and a metallic thin plate. The stereo support is configured in box structure. The metallic thin plate is installed on a side of the stereo support. The crew-cut noise-absorbing wedges are installed on the other side of the stereo support. The metallic thin plate is provided with multiple micropores. The central hollow chamber of the stereo support is filled with in-situ resonance material. Each crew-cut noise-absorbing wedge is a tip-free four-side pyramid. The bottom of the protective screen is provided with an inwardly-recessed portion connecting groove. The double-layer stereo noise-reducing protective screen is capable of effectively reducing low-frequency noise, easy to repair, convenient to update, and long in service life.