Novel livestock ear tag

The invention provides a novel livestock ear tag which is simple in structure and novel in design. The novel livestock ear tag comprises a main tag body and an auxiliary tag body, and is characterized in that the main tag body is composed of an ear tag seat, an ear tag neck and an ear tag head, the ear tag neck is fixedly connected on the ear tag seat, the ear tag head is connected screwed on the ear tag neck, a center hole is formed in the auxiliary tag body, a fluorescent plate is adhered onto the circular ring of the upper end of the center hole, a loop antenna is embedded in the auxiliary tag body, a chip is disposed inside the auxiliary tag body, a base built-in ring is arranged inside the auxiliary tag body, and a through hole is formed in the center of the base built-in ring. The ear tag head is a tapered nut. The ear tag neck is provided with a bolt. The ear tag neck is used for penetrating the ear of livestock to be remained in the through hole, the ear tag head is used for penetrating the ear of the livestock to be embedded in the through hole of the ear tag seat of the cylinder-frustum-shaped auxiliary tag body and the center hole of a cone-frustum-shaped ear tag buckle, and the ear tag head and the cone-frustum-shaped ear tag buckle of the auxiliary tag body are buckled mutually to be used for fixing the ear tag. The novel livestock ear tag is simple in structure, convenient to produce and low in cost.