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 (B); 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 (B); 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 (B); 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 . <EOS>