A camera module, a camera assembly and an electronic device are provided. The camera module includes a casing, a mounting base, a light deflection element, an image sensor and a driving device. The casing has a light inlet. The mounting base is disposed in the casing. The light deflection element is fixed to the mounting base, and configured to deflect an incident light entering through the light inlet. The image sensor is arranged in the casing and configured to sense the defected incident light. The driving device has an arc rail, and is configured to drive the mounting base to rotate around a central axis of the arc rail along the arc rail.