The utility model relates to an improved sound insulation structure of an earmuff,The earmuff is provided with two outer covers on both sides and a buckle groove on the inner side,A hood belt is arranged between the two outer hoods,The two outer covers are respectively provided with a sound-absorbing sponge or a liquid foaming sound insulation material,The two outer covers are respectively protruded and buckled with a cover ear pad with a central containing chamber,The side edge of the cover ear pad is provided with one side buckle convex corresponding to the upper buckle groove of the cover；The utility model is characterized in that: under the upper buckle groove of the second outer cover is provided with a lower buckle part or at least two lower buckle parts or the inner bottom of the second outer cover is provided with at least one bottom buckle part or a bottom buckle part which is sleeved with an outer cover and corresponds to the liquid foaming sound insulation material；And the inner part of the outer cover and the lower part of the ear pad of the outer cover are further provided with a sponge inner cover,Its side edge is provided with a side buckle part or at least two bottom buckle parts or at least one inner bottom buckle part corresponding to the bottom buckle part of the outer cover.Or it is characterized in that the inner part of the outer cover is arranged with a sponge inner cover under the ear pad of the outer cover.With this structure, the inner cover can be covered with the outer cover and the noise can be blocked at the outer side of the outer cover and the inner cover.一種耳罩隔音改良結構，該耳罩於兩側設有二外罩且於其內側具有一上扣槽，該二外罩間設有連接之一罩頭帶，該二外罩內分別設有一吸音海綿或液體發泡隔音材料，該二外罩另分別凸出扣設有中央具容室之罩耳墊，該罩耳墊側緣設有對應外罩其上扣槽之一側扣凸；其特徵在於︰二外罩其上扣槽下方設有一下扣部或至少二下側扣部或二外罩其內底部設有至少一底扣部或穿套外罩並對應液體發泡隔音材料之底扣部；而外罩內部並位於罩耳墊下方更附設有一具海綿之內罩，其側緣設有一對應外罩其下扣部或下側扣部之側扣部或至少二下側扣部或對應底扣部之至少一內底扣部。或其特徵在於︰外罩內部位於罩耳墊下方設有一具海綿之內罩。藉此結構，可將內罩包覆外罩並使噪音阻隔於外罩及內罩外側。
