Long-acting totally-closed water-seal odor-preventing trap

The utility model discloses a long-acting totally-closed water-seal odor-preventing trap which comprises a trap main body, wherein the trap main body comprises a housing and a bottom cover; a water seal structure is arranged in the trap main body and comprises a water seal outer jacket and a water seal inner jacket; the water seal outer jacket is mounted on a bottom surface of the bottom cover; an upper edge of the water seal inner jacket is connected with the top of the housing; a floating plate provided with a spring is additionally arranged between a lower end opening of the water seal inner jacket and the bottom surface of the bottom cover to form a first seal structure; the first seal structure comprises the sheet-like floating plate and the spring; the floating plate is matched with the lower end opening of the water seal inner jacket; the spring is positioned between the bottom surface of the bottom cover and the floating plate; the floating plate is used for sealing the lower end opening of the water seal inner jacket under the action of the spring; at the same time, an annular water seal panel used for sleeving the water seal inner sleeve is arranged above the water seal outer jacket and used for sealing an upper end opening of a vertical water channel between side walls of the water seal inner jacket and the water seal outer jacket, so that a water body in the water seal structure is long reserved by utilizing the two seal structures and a purpose of long-time water seal is achieved.