A screen protecting assembly for an electronic device includes a pivot shaft, a cushion, and two connecting subassemblies positioned on the electronic device. Each connecting subassembly has a base and a rotating member rotatably received in the base. The rotating member engages with the pivot shaft. The cushion coils on the pivot shaft. When the rotating member is rotated in a first direction, the cushion unfolds to cover a screen of the electronic device. When the rotating member is rotated in a second direction opposite to the first direction, the cushion coils on the pivot shaft so that the screen of the electronic device is exposed.