An atomizer with an upgraded air passage structure comprising: a housing, the housing including a mouth piece at one end 110 thereof; a heating piece; and an air passage disposed in the housing; the heating piece is disposed inside an atomizing chamber, the mouth piece being in communication with the atomizing chamber, a blocking piece is disposed in the air passage and configured for blocking an airflow; the blocking piece divides the air passage into an air inlet area and an air outlet area; the air outlet area and the air inlet area are both disposed at an axial position that is different with the atomizing chamber; the atomizing chamber is respectively communicated with the air inlet area and the air outlet area; the air in the air inlet area flows to the atomizing chamber, then flows to the air outlet area; characterized in that: the blocking piece at comprises a silicon seat and a base; the air inlet area and the air outlet area are defined by the silicon seat matching with the base and a supporter for fixing the heating piece; where the atomizing chamber is defined by the base and the supporter for fixing the heating piece; a bottom of the base has a recessed shape, used for accumulating a certain amount of the tobacco liquid; a protuberant separating bar is formed on a surface of the blocking piece; the separating bar is integrally manufactured with the silicon seat; the separating bar defines the air inlet area and the air outlet area by dividing a space between the housing and the liquid storage cup into two side areas. a housing, the housing including a mouth piece at one end 110 thereof; a heating piece; and an air passage disposed in the housing; the heating piece is disposed inside an atomizing chamber, the mouth piece being in communication with the atomizing chamber, a blocking piece is disposed in the air passage and configured for blocking an airflow; the blocking piece divides the air passage into an air inlet area and an air outlet area; the air outlet area and the air inlet area are both disposed at an axial position that is different with the atomizing chamber; the atomizing chamber is respectively communicated with the air inlet area and the air outlet area; the air in the air inlet area flows to the atomizing chamber, then flows to the air outlet area; characterized in that: the blocking piece at comprises a silicon seat and a base; the air inlet area and the air outlet area are defined by the silicon seat matching with the base and a supporter for fixing the heating piece; where the atomizing chamber is defined by the base and the supporter for fixing the heating piece; a bottom of the base has a recessed shape, used for accumulating a certain amount of the tobacco liquid; a protuberant separating bar is formed on a surface of the blocking piece; the separating bar is integrally manufactured with the silicon seat; the separating bar defines the air inlet area and the air outlet area by dividing a space between the housing and the liquid storage cup into two side areas. the blocking piece at comprises a silicon seat and a base; the air inlet area and the air outlet area are defined by the silicon seat matching with the base and a supporter for fixing the heating piece; where the atomizing chamber is defined by the base and the supporter for fixing the heating piece; a bottom of the base has a recessed shape, used for accumulating a certain amount of the tobacco liquid; a protuberant separating bar is formed on a surface of the blocking piece; the separating bar is integrally manufactured with the silicon seat; the separating bar defines the air inlet area and the air outlet area by dividing a space between the housing and the liquid storage cup into two side areas.