A delineator post with a restoration function includes a base panel, a delineator body fixed to the base panel and a tubular elastic band connecting the base panel and the delineator body. The delineator body has a disposition space formed therein. The tubular elastic band extends from the base panel to the top of the delineator body through the disposition space. The delineator post further includes a restoration rod having an upper portion inserted into the disposition space of the delineator body and capable of restoring the delineator body. In this configuration, when the delineator post is tilted by an external force caused by a vehicle or laid down by being trampled by a tire of a vehicle, the delineator post may restore its original shape by the above configuration of the restoration rod.