Embodiments of the present application disclose a protective case for a portable electronic device, which includes a rear shell and a camera decorative ring, the rear shell includes a back plate and a clamping element, the back plate is provided with an avoidance hole, and the inner wall surface of the avoidance hole is provided with a first retention groove, the outer peripheral surface of the camera decorative ring is provided with a limit surface, and a limit part is formed between the limit surface and the inner end surface of the camera decorative ring; the limit part is embedded in the first retention groove, and the inner end surface of the camera decorative ring is evenly aligned with or lower than the inner surface of the back plate.