An array camera module having a height difference, a circuit board assembly and a manufacturing method therefor, and an electronic device. The array camera module comprises a first camera module unit and a second camera module unit, wherein the first camera module unit comprises at least one first photosensitive assembly and at least one first lens; the first lens is located on a photosensitive path of the first photosensitive assembly; the first photosensitive assembly comprises at least one extension portion; the extension portion at least partially extends towards the direction away from the first photosensitive assembly; and the second camera module unit is fixedly connected to a second extension portion, so that the ends of the two camera module units are consistent.