The invention discloses an automatic door of an automobile driving window. The automatic door comprises a driving window upper frame, a driving window side frame plate is fixedly mounted on the outersurface of one side of the driving window upper frame; a rearview mirror mounting plate is fixedly mounted on the lower surface of the driving window upper frame, two rearview mirror fixing holes areformed in the front surface of the rearview mirror mounting plate, a driving window lower frame is fixedly mounted on the lower surfaces of the driving window side frame plate and the rearview mirrorfixing holes, and an inner door lock fixing plate is fixedly mounted on the lower surface of the driving window lower frame. According to the invention, door closing sound can be reduced through buffering when the vehicle door is closed; and through elastic extrusion of the movable elastic piece, the sealing edge strip is always attached to a vehicle frame for sealing, the situation that the sealing performance of the vehicle door is reduced after rubber is used for a long time and aged is prevented, through buffering of the double-layer structure and the sleeve fixing rubber block, the impactresistance strength and elasticity are improved, and the scrap degree of the vehicle door bumper bar is reduced.