The invention relates to the technical field of a household appliance, in particular to a cover body assembly and a household appliance. The cover assembly provided by the invention comprises a cover body structure, wherein one end of the cover body structure is used for being rotatablely connected onto a main body structure of the household appliance so that the cover body structure can be opened and closed relative to the main body structure; in addition, the cover body assembly also comprises a sealing element arranged on the cover body structure; a projected part is formed between a first sealing part of the sealing element and a second sealing part bended towards the upper side relative to the first sealing part; a hollow space is formed between the upper surface of the projected part and the cover body structure; in addition, the lower surface of the projected part is abutted against and connected with the top wall of the main body structure. The tight sealing is formed between the projected part of the sealing element and the main body structure; the sealing effect is good; water vapor and the like can be more effectively prevented from being leaked from a gap formed between the cover body structure and the main body structure.