Noise reduction shell

The utility model provides a noise reduction shell which is applied to the field of sound insulation and noise reduction and comprises a cover shell covering a noise source, noise is emitted to the outside through the cover shell, noise reduction capacity is improved by arranging noise reduction reinforcing ribs on the inner surface of the cover shell in a protruding mode, and transverse reinforcing ribs and longitudinal reinforcing ribs intersect with each other to form a polygon. The centroid and the vertex of the polygon are connected to form an inclined reinforcing rib, the silencing reinforcing rib is of a plate-shaped structure perpendicular to the inner surface of the cover shell, and a silencing space is defined by the transverse and longitudinal reinforcing ribs and the inclined reinforcing rib, so that the damping coefficient of sound transmitted in the cover plate is increased, the damping of a transmission path is increased, and the loss of noise transmitted in the cover plate is increased; theref