The invention discloses hull block turning equipment provided with clamping and protecting mechanisms during ship construction. The hull block turning equipment comprises a rotary table (11). Two sides of the rotary table (11) are fixed on rotary rings (21) used for overturning respectively. The rotary table (11) comprises an electromagnet adsorption component and a plane attached to a hull block. Each rotary ring (21) rotates together with an outer side driving gear (33). Wide slots are formed at the edge, contacting with the hull block, of the rotary table (11). Movable clamping components are arranged in the wide slots. Each movable clamping component comprises a track frame component which is perpendicular to the plane of the rotary platform and moves outwards parallelly to the plane of the rotary platform. Clamping claws are arranged in the track frame components. Each clamping claw is provided with a hydraulic component for moving the claws in two directions. By the hull block turning equipment, construction cost is greatly reduced, and construction efficiency is improved.