The invention relates to an intra-die overturning and material loading mechanism for an automobile die. The intra-die overturning and material loading mechanism comprises a base plate. A front vertical plate, a front supporting seat and a rear supporting seat are fixed to the base plate. A rotary air cylinder is fixed to the front vertical plate. The intra-die overturning and material loading mechanism further comprises a rigid assembly which is fixedly connected with the rotating end of the rotary air cylinder. The end, backing against the rotary air cylinder, of the rigid assembly is connected with the rear supporting seat in a rotary manner through a hollow shaft. Multiple fixing devices for fixing a product are symmetrically arranged on the rigid assembly. Each fixing device comprises two extending-and-contracting air cylinders fixed to the rigid assembly and supporting pillars fixed to the movable ends of the extending-and-contracting air cylinders. In the machining process, the product is placed into the rigid assembly; the two sides of the product are clamped through the extending-and-contracting air cylinders on the upper portions of the fixing devices which are symmetrically arranged; then the upper surface of the product is machined; after machining is completed, the rotary air cylinder drives the rigid assembly to be overturned by 180 degrees wholly, and the back face of the product is machined; and then 180-degree overturning is conducted for discharging; and double-face machining is achieved, and meanwhile applicability to products of different sizes is good.