Double-layer sound insulation and noise reduction device and atomizer

A double-layer sound insulation and noise reduction device features a noise reduction main body 100, a water baffle 200 and a connecting member (108, fig 2). The noise reduction main body includes an annular outer wall 101 and an annular inner wall 102, the annular inner wall is spaced apart from the annular outer wall to form a sound insulation cavity 300, and the connecting member is connected between the annular inner wall and the annular outer wall. A side of the annular outer wall has an outer wall ventilation opening 105 and a side of the annular inner wall is provided with an inner wall ventilation opening 107 that communicates with the outer wall ventilation opening. A bottom of the annular inner wall has a water passing hole 106. The connecting member can be a ring (108a, fig 3) or a beam (108b, fig 5) that connects the bottom edges of the inner and outer annular walls, or a platform (108c, fig 10) that connects the bottom of outer annular wall to a surface of the inner annular wall.