The invention relates to a device and a method for integrating a fully-automatic diaphragm and a shutter of an area-array camera. The device for integrating the fully-automatic diaphragm and the shutter of the area-array camera comprises an optical imaging assembly, a variable diaphragm assembly, a shutter assembly, a light detection assembly and a control system assembly, wherein the control system assembly is used for light detection, fully-automatic control of a variable diaphragm and fully-automatic control of the switching on and off of the shutter; the optical imaging assembly comprises an optical imaging assembly front group and an optical imaging assembly rear group; the variable diaphragm assembly is arranged at the position of an aperture diaphragm between the optical imaging assembly front group and the optical imaging assembly rear group; the shutter assembly is arranged between the variable diaphragm assembly and the optical imaging assembly rear group; and an optical axis of the light detection assembly is parallel to an optical axis of the optical imaging assembly. According to the device and the method disclosed by the invention, the technical problem of difficult integration of the fully-automatic diaphragm and the shutter in a large-format onboard camera in a background technology is solved.