A back cover of an electronic device and an electronic device are provided. The back cover of the electronic device includes: a first structure layer including a first region and a second region, where a thickness of the first region is greater than a thickness of the second region, the second region forms a second region orthographic projection along a thickness direction of the electronic device, a battery of the electronic device forms a battery orthographic projection along the thickness direction of the electronic device, and the second region orthographic projection includes the battery orthographic projection. The back cover can be adapted to a middle frame of an electronic device with a glass back cover.