The utility model discloses a spur dike structure suitable for the conditions of large specific descent and large flow velocity. The dam head protection structure comprises a dam body with a trapezoidal cross section, at least one layer of protection block is laid on a riverbed at the bottom of a dam head at the outer end of the dam body in an outward extending mode to form the dam head protectionstructure, the overlooking direction of the dam head protection structure is a rectangle with the upstream end shorter than the downstream end, and the dam head protection structure is characterizedin that the protection block is an artificial fish reef. The ecological floating bed has the advantages of being good in strength, good in impact resistance, longer in service life and more beneficialto protection and restoration of the water body ecological environment.