The utility model discloses a novel fishbone dam structure which comprises a longitudinal dam located at the front end of a beach and extending towards the upstream, one side of the longitudinal dam is close to a river bank to form a navigation side, the side, deviating from the navigation side, of the longitudinal dam further extends outwards to form a branch dam, and the novel fishbone dam structure is characterized in that the whole branch dam is of an arc-shaped structure with the outer side bent outwards and backwards. The utility model has the advantages of better stability, longer service life and better ecological protection effect.