Abstract: The present invention relates to an air spray device for a heterogeneous mixture coating solution without a separate stirring device. The air spray device 100 comprises: a main body 110 provided with a heterogeneous mixture coating solution inlet 111 and an inlet 112 for compressed air from the outside; an extension block 120 coupled in a downwardly extended shape at the lower end of the main body; a nozzle assembly 130 coupled at the lower end of the extension block; a communication path 140 vertically formed in the centers of the main body, the extension block and the nozzle assembly; a needle valve 150 provided inside the communication path; and a plunger 160 formed in a plate shape to be positioned in proximity to the bottom side of the communication path of the extension block to stir the heterogeneous mixture coating solution.