An atomizing assembly for an inhaler, comprising: a sleeve; a mouthpiece located at an end of the sleeve; and an atomizer located in the sleeve; characterized in that the atomizer comprises: a housing defining an air flow passage therein and having a liquid reservoir for storing liquid; a negative electrode connecting element comprising a negative electrode connecting element body and a boss, wherein an end of the housing or the negative electrode connecting element defines a cavity, or the negative electrode connecting element and the housing cooperatively forms a cavity, the cavity is in communication with the air flow passage; the negative electrode connecting element body defines an air inlet in communication with the cavity and an outside of the negative electrode connecting element body; wherein the boss is located at an outer periphery of the negative electrode connecting element body; the negative electrode connecting element body and the boss are conductors; the negative electrode connecting element body is electrically connected to the boss; and an atomizing element located in the cavity, the liquid in the liquid reservoir being capable of flowing into the atomizing element; the sleeve comprises: an abutting portion, which is a conductor, the abutting portion is in contact with the boss, thus implementing an electrical connection between the abutting portion and the boss; and a first sleeve, a second sleeve, and a third sleeve, which are coaxially arranged, wherein an end of the first sleeve is in contact with an end of the second sleeve, the third sleeve sleeves on an outside of the first sleeve and the second sleeve, such that the first sleeve and the second sleeve are fixed together, the second sleeve is a conductor, and the abutting portion is located in an inner wall of the second sleeve, such that the abutting portion is electrically connected to the second sleeve, the second sleeve is provided with an internal thread, such that the second sleeve is capable of being threadedly engaged with a power assembly provided with an external thread. a sleeve; a mouthpiece located at an end of the sleeve; and an atomizer located in the sleeve; characterized in that the atomizer comprises: a housing defining an air flow passage therein and having a liquid reservoir for storing liquid; a negative electrode connecting element comprising a negative electrode connecting element body and a boss, wherein an end of the housing or the negative electrode connecting element defines a cavity, or the negative electrode connecting element and the housing cooperatively forms a cavity, the cavity is in communication with the air flow passage; the negative electrode connecting element body defines an air inlet in communication with the cavity and an outside of the negative electrode connecting element body; wherein the boss is located at an outer periphery of the negative electrode connecting element body; the negative electrode connecting element body and the boss are conductors; the negative electrode connecting element body is electrically connected to the boss; and an atomizing element located in the cavity, the liquid in the liquid reservoir being capable of flowing into the atomizing element; a housing defining an air flow passage therein and having a liquid reservoir for storing liquid; a negative electrode connecting element comprising a negative electrode connecting element body and a boss, wherein an end of the housing or the negative electrode connecting element defines a cavity, or the negative electrode connecting element and the housing cooperatively forms a cavity, the cavity is in communication with the air flow passage; the negative electrode connecting element body defines an air inlet in communication with the cavity and an outside of the negative electrode connecting element body; wherein the boss is located at an outer periphery of the negative electrode connecting element body; the negative electrode connecting element body and the boss are conductors; the negative electrode connecting element body is electrically connected to the boss; and an atomizing element located in the cavity, the liquid in the liquid reservoir being capable of flowing into the atomizing element; the sleeve comprises: an abutting portion, which is a conductor, the abutting portion is in contact with the boss, thus implementing an electrical connection between the abutting portion and the boss; and a first sleeve, a second sleeve, and a third sleeve, which are coaxially arranged, an abutting portion, which is a conductor, the abutting portion is in contact with the boss, thus implementing an electrical connection between the abutting portion and the boss; and a first sleeve, a second sleeve, and a third sleeve, which are coaxially arranged, wherein an end of the first sleeve is in contact with an end of the second sleeve, the third sleeve sleeves on an outside of the first sleeve and the second sleeve, such that the first sleeve and the second sleeve are fixed together, the second sleeve is a conductor, and the abutting portion is located in an inner wall of the second sleeve, such that the abutting portion is electrically connected to the second sleeve, the second sleeve is provided with an internal thread, such that the second sleeve is capable of being threadedly engaged with a power assembly provided with an external thread.