A vaporizer, comprising: a vaporization shell; a vaporization assembly; and a protective assembly, wherein the vaporization shell comprises a liquid storage cavity, wherein the vaporization assembly is arranged in the vaporization shell and comprises a heating structure and a liquid flowing channel, wherein the liquid flowing channel is in communication with the heating structure, wherein the protective assembly is linked with the vaporization shell, and is rotatable by the rotation of the vaporization shell, characterized in that the protective assembly further comprises at least one of the following features: a liquid flowing control mechanism arranged in the vaporization shell and rotatable by the rotation of the vaporization shell; a conductive structure arranged in an end of the vaporization shell and rotatable by the rotation of the vaporization shell, and the conductive structure is configured to regulate the on-off of the circuit between the vaporization assembly and a power supply assembly; and an air inlet control mechanism comprising a movable member and a communication airway, the movable member is linked with the vaporization shell, and the communication airway is arranged on the movable member, and is rotatable by a rotation of the movable member. a vaporization shell; a vaporization assembly; and a protective assembly, wherein the vaporization shell comprises a liquid storage cavity, wherein the vaporization assembly is arranged in the vaporization shell and comprises a heating structure and a liquid flowing channel, wherein the liquid flowing channel is in communication with the heating structure, wherein the protective assembly is linked with the vaporization shell, and is rotatable by the rotation of the vaporization shell, characterized in that the protective assembly further comprises at least one of the following features: a liquid flowing control mechanism arranged in the vaporization shell and rotatable by the rotation of the vaporization shell; a conductive structure arranged in an end of the vaporization shell and rotatable by the rotation of the vaporization shell, and the conductive structure is configured to regulate the on-off of the circuit between the vaporization assembly and a power supply assembly; and an air inlet control mechanism comprising a movable member and a communication airway, the movable member is linked with the vaporization shell, and the communication airway is arranged on the movable member, and is rotatable by a rotation of the movable member. a liquid flowing control mechanism arranged in the vaporization shell and rotatable by the rotation of the vaporization shell; a conductive structure arranged in an end of the vaporization shell and rotatable by the rotation of the vaporization shell, and the conductive structure is configured to regulate the on-off of the circuit between the vaporization assembly and a power supply assembly; and an air inlet control mechanism comprising a movable member and a communication airway, the movable member is linked with the vaporization shell, and the communication airway is arranged on the movable member, and is rotatable by a rotation of the movable member.