The invention proposes a Mira separation structure model for air automotive aerodynamics research. The Mira separation structure model comprises a main body, a tail cover, an intermediate plate and abottom plate, wherein the main body is an automotive body model framework, a front half part of the main body is an engine cabin and driver cabin, the engine cabin and the driver cabin both are cavities, a passenger cabin and a rear compartment position of a rear half part of the main body are cavities, the intermediate plate, the bottom plate and the main body are spliced to seal the cavity, a mortise is arranged on a back surface of a front row part of the passenger cabin, the tail cover is arranged on the intermediate plate, a tenon is arranged at a front end of the tail cover and is inserted into the mortise on the back surface of the front row part of the passenger cabin, an outer surface is flush after an edge of a lower end of the tail cover is spliced with a rear half part framework of the main body, and a plurality of pressure measurement holes are formed in each surface of the automotive body. By the model, the model weight is greatly reduced, and carrying and adjustment arefacilitated; and meanwhile, a measurement device is also convenient to install in the model, turbulent flow caused by an external measurement device to intervene experiment data can be prevented, thetail cover can be replaced, and comparison research is performed.