The utility model discloses an automobile intercooler air chamber. A separation plate is arranged in an upper air chamber of an intercooler and divides the air chamber into an air inlet cavity and an air outlet cavity. Long-battlement-shaped openings are formed in the end portion of the separation plate in the air chamber, guide bars are arranged in the air inlet cavity and the air outlet cavity of the air chamber respectively, the long-battlement-shaped openings in the end portion of the separation plate enable air flow of the air inlet cavity and the air flow of the air outlet cavity to be exchanged mutually, the temperature difference of cooling pipes on the two sides of the separation plate of the upper air chamber is lowered, the cooling pipes on the two sides of the separation plate are prevented from generating hot stress, and the breakage mode of the cooling pipes is effectively reduced. Air flow in the cavities of the air chamber is made to be reasonably distributed through the guide bars, and heat radiation is facilitated. The overall strength of the upper air chamber is enhanced through the guide bars, the amplitude of the reciprocating motion of a core main sheet is reduced, and therefore the main sheet is prevented from being broken off.