The utility model provides an anti-loosening fixing piece for a corrugated plate protection device. The corrugated plate protection device comprises a main body supporting frame and a corrugated plateinstalled on the main body supporting frame through the anti-loosening fixing piece. The anti-loosening fixing part comprises a locking part and a locking part, wherein the connecting angle steel isinstalled on the main body supporting frame, the corrugated plate and the connecting angle steel are fixedly installed, an energy dissipation concave-convex gasket and a connecting assembly used for fixedly installing different sub corrugated plates are arranged at the connecting position of the corrugated plate and the connecting angle steel, and the connecting assembly comprises a connecting bolt and a connecting nut. The first anti-loosening gasket and/or the second anti-loosening gasket are/is matched with the connecting assembly to prevent the connecting assembly from loosening, and the first anti-loosening gasket and the second anti-loosening gasket are/is arranged between the connecting assembly and the corrugated plate.