The invention discloses a bionic robot fish and relates to the technical field of underwater robots. The bionic robot fish structurally comprises a head portion, a body portion and a tail portion which are sequentially connected; the front end of the head portion is provided with a thin and long sharp-end structure; the outer surface of the head portion is of a streamline structure; the body portion comprises a fish skin and a propelling system; the overall shape of the fish skin is of a streamline structure; a plurality of grooves are distributed in the upper edge of the fish skin side by side in the direction of the long axis of the fish skin; the propelling system drives the body portion to swing to achieve underwater movement of the bionic robot fish; and the tail portion comprises a tail fin support and a tail fin. The bionic robot fish reduces fluid resistance during swimming, is reliable in work and is high in bionic degree.