A cartridge comprising a cartridge body, a base provided at one end of the cartridge body, and an atomizing head received in the cartridge body, wherein the atomizing head comprises a heating structure, the heating structure has two pins, a first pressing member and a second pressing member are installed on the base; the first pressing member presses and fixes one of the pins on the base and is electrically connected to the pin, the second pressing member presses and fixes the other pin on the base and is electrically connected to the other pin; an upper end surface of the base extends upward to form a hollow connecting barrel, the atomizing head further comprises an atomizing tube sleeved on the connecting barrel, the atomizing tube is provided with an atomizing chamber in communication with the connecting barrel, the heating structure is received in the atomizing chamber, one of the pins passes through an inner cavity of the connecting barrel and is pressed and fixed by the first pressing member, the other pin passes through the inner cavity of the connecting barrel and is pressed and fixed by the second pressing member; the cartridge body has a liquid storage chamber, a side wall of the atomizing tube is provided with a liquid inlet, the liquid inlet is in communication with the liquid storage chamber and the atomizing chamber, the heating structure comprises a liquid guiding member and a heating member that are in contact with each other, the two pins are provided on the heating member, the liquid guiding member is attached to an inner wall of the atomizing tube corresponding to the liquid inlet; characterized in that the cartridge further comprises a sealing member received in a lower end of the cartridge body, the base is located under and connected to the sealing member, a through hole is provided at the center of the sealing member along an axial direction of the sealing member, the through hole extends through upper and lower end surfaces of the sealing member, a lower end of the atomizing tube is inserted into the through hole, an upper end of the atomizing tube is received in the liquid storage chamber, the connecting barrel is inserted into a lower end of the atomizing tube. an upper end surface of the base extends upward to form a hollow connecting barrel, the atomizing head further comprises an atomizing tube sleeved on the connecting barrel, the atomizing tube is provided with an atomizing chamber in communication with the connecting barrel, the heating structure is received in the atomizing chamber, one of the pins passes through an inner cavity of the connecting barrel and is pressed and fixed by the first pressing member, the other pin passes through the inner cavity of the connecting barrel and is pressed and fixed by the second pressing member; the cartridge body has a liquid storage chamber, a side wall of the atomizing tube is provided with a liquid inlet, the liquid inlet is in communication with the liquid storage chamber and the atomizing chamber, the heating structure comprises a liquid guiding member and a heating member that are in contact with each other, the two pins are provided on the heating member, the liquid guiding member is attached to an inner wall of the atomizing tube corresponding to the liquid inlet; characterized in that the cartridge further comprises a sealing member received in a lower end of the cartridge body, the base is located under and connected to the sealing member, a through hole is provided at the center of the sealing member along an axial direction of the sealing member, the through hole extends through upper and lower end surfaces of the sealing member, a lower end of the atomizing tube is inserted into the through hole, an upper end of the atomizing tube is received in the liquid storage chamber, the connecting barrel is inserted into a lower end of the atomizing tube.