An inflatable automobile seat solves the problems that an automobile seat can not bring enough comfort to the lumbar vertebra and cervical vertebra of people and a passenger is easy to knock the head against window glass when sleeping in riding. Partial gas in a gas storage device of an automobile is led out by a conduit, then the gas led out passes through a negative booster and the negative booster conducts pressure reduction on the gas. The conduit is used for causing the gas, the pressure of which is reduced through the negative booster, to pass through a button switch, when pressing down the button switch, the gas can enter a waist inflatable device, a neck inflatable device and a face inflatable device of the inflatable automobile seat through a metal mesh of the button switch. The certain space of the inflatable devices can determine the inflatable quantity according to different requirements. When the passenger feels excessive gas in the waist, the neck and a part protecting the face, the button switch can be pressed to release part of gas with the redundant gas remaining in the inflatable devices. The button switch can be used for wholly releasing the gas in the waist, the neck and the face of the seat. The inflatable automobile seat is practical and easy to promote.