An anti-EMI antenna includes a first substrate layer, a grounding layer, a first circuit layer, a second substrate layer, a second circuit layer, a third substrate layer, a third circuit layer, a fourth substrate layer, and a fourth circuit layer. The grounding layer is mounted on a bottom surface of the first substrate layer, and includes a grounding circuit. The grounding circuit fully covers the bottom surface of the first substrate layer. Since the grounding circuit fully covers the bottom surface of the first substrate layer, the antenna radiation circuit can prevent the EMI from a bottom side of the anti-EMI antenna. Therefore, electromagnetic waves can be mostly isolated to prevent noise caused by the EMI.