A cartridge, comprising: a cartridge casing with a liquid storage chamber therein; a sealing member for sealing the liquid storage chamber; a shielding member provided on the cartridge casing; an atomizing chamber; a smoke outlet passage; and an air inlet passage; wherein the atomizing chamber is in communication with the liquid storage chamber, the smoke outlet passage and the air inlet passage, the sealing member is located between the shielding member and the cartridge casing, the shielding member forms part of the outer contour of the cartridge and the sealing member is shielded by the shielding member, a communication opening is defined through the shielding member, the sealing member is an elastically deformable member; the cartridge comprises a mouthpiece and a bottom base, the mouthpiece is arranged at one end of the cartridge casing along the axial direction of the cartridge casing, the mouthpiece is provided with a smoke outlet opening, the bottom base is arranged at the other end of the cartridge casing along the axial direction of the cartridge casing opposite to the mouthpiece, the liquid storage chamber is provided in the cartridge casing along the axial direction of the cartridge casing, one of the mouthpiece and the bottom base serves as the shielding member; the cartridge comprises a liquid guiding member, the liquid guiding member is made of porous material, the liquid guiding member is a hollow structure with both ends being opened, an inner cavity of the liquid guiding member forms the atomizing chamber, the liquid guiding member is arranged along the axial direction of the cartridge casing, the liquid guiding member is at least partially received in the liquid storage chamber, the liquid guiding member is located at one end of the liquid storage chamber adjacent to the bottom base, the smoke outlet passage is located in the liquid storage chamber and is isolated from the liquid storage chamber; when filling liquid, a liquid injection needle passes through the communication opening and pierces the sealing member, and then extends into the liquid storage chamber to inject e-liquid, and the air in the liquid storage chamber enters into the atomizing chamber and is discharged through the air inlet passage and/or the smoke outlet passage; when the liquid injection needle is pulled out after liquid injection, the sealing member automatically restores to seal the liquid storage chamber again. a cartridge casing with a liquid storage chamber therein; a sealing member for sealing the liquid storage chamber; a shielding member provided on the cartridge casing; an atomizing chamber; a smoke outlet passage; and an air inlet passage; wherein the atomizing chamber is in communication with the liquid storage chamber, the smoke outlet passage and the air inlet passage, the sealing member is located between the shielding member and the cartridge casing, the shielding member forms part of the outer contour of the cartridge and the sealing member is shielded by the shielding member, a communication opening is defined through the shielding member, the sealing member is an elastically deformable member; the cartridge comprises a mouthpiece and a bottom base, the mouthpiece is arranged at one end of the cartridge casing along the axial direction of the cartridge casing, the mouthpiece is provided with a smoke outlet opening, the bottom base is arranged at the other end of the cartridge casing along the axial direction of the cartridge casing opposite to the mouthpiece, the liquid storage chamber is provided in the cartridge casing along the axial direction of the cartridge casing, one of the mouthpiece and the bottom base serves as the shielding member; the cartridge comprises a liquid guiding member, the liquid guiding member is made of porous material, the liquid guiding member is a hollow structure with both ends being opened, an inner cavity of the liquid guiding member forms the atomizing chamber, the liquid guiding member is arranged along the axial direction of the cartridge casing, the liquid guiding member is at least partially received in the liquid storage chamber, the liquid guiding member is located at one end of the liquid storage chamber adjacent to the bottom base, the smoke outlet passage is located in the liquid storage chamber and is isolated from the liquid storage chamber; when filling liquid, a liquid injection needle passes through the communication opening and pierces the sealing member, and then extends into the liquid storage chamber to inject e-liquid, and the air in the liquid storage chamber enters into the atomizing chamber and is discharged through the air inlet passage and/or the smoke outlet passage; when the liquid injection needle is pulled out after liquid injection, the sealing member automatically restores to seal the liquid storage chamber again.