Electronic cigarette sensor capable of being reversely started

An electronic cigarette sensor capable of being started reversely comprises a packaging support, an upper cover, a lower cover, a protective net, a micro-electro-mechanical sensor and an ASIC chip, a high step is arranged on one side of the bottom wall of a cavity, a gas guide channel penetrating through the high step and the bottom wall of the packaging support is arranged on the high step, the micro-electro-mechanical sensor is further arranged on the high step, and the ASIC chip is arranged on the gas guide channel. The position, far away from the high step, in the cavity is a low step, the ASIC chip is fixed to the low step, the positions of the diaphragm and the back pole plate are affected by the change of the air pressure of smoking, the diaphragm is far away from the back pole plate due to the suction airflow direction, the distance between the diaphragm and the back pole plate is increased, and the capacitance value is decreased. According to the electronic cigarette, the changed capacitance value of