An aroma diffuser comprising a housing (1) and a cover (2). The housing (1) comprises a base plate (11) and a side wall connected to the base plate (11). The base plate (11) and the side wall (13) collectively form an accommodating cavity (10). The housing (1) further comprises an opening (101) communicating with the accommodating cavity (10) and the exterior of the diffuser. The cover (2) comprises an engagement portion (23) extending into the opening (101) and movably connected to the side wall (13). The engagement portion (23) is provided with a through hole (30), and a bottom portion of the through hole (30) is arranged to face the base plate (11). When the cover (2) is moved away from the base plate (11), a gap is formed between the base plate (11) and the engagement portion (23), and the accommodating cavity (10) communicates with the exterior of the diffuser via the gap and the through hole (30). When the cover (2) is moved toward the base plate (11) to the lowest position, the base plate (11) is pressed against the engagement portion (23) and closes the bottom portion of the through hole (30). The aroma diffuser does not require a barrier structure, and opening or closing of an aroma diffusing channel is controlled by means of moving the cover (2).L'invention concerne un diffuseur d'arôme comprenant un boîtier (1) et un couvercle (2). Le boîtier (1) comprend une plaque de base (11) et une paroi latérale reliée à la plaque de base (11). La plaque de base (11) et la paroi latérale (13) forment collectivement une cavité de réception (10). Le boîtier (1) comprend en outre une ouverture (101) communiquant avec la cavité de réception (10) et l'extérieur du diffuseur. Le couvercle (2) comprend une partie de mise en prise (23) s'étendant dans l'ouverture (101) et reliée de façon mobile à la paroi latérale (13). La partie de mise en prise (23) est pourvue d'un trou traversant (30), et une partie inférieure du trou traversant (30) est disposée de manière à faire face
