The invention relates to the technical field of water washing equipment for circuit boards and discloses a water suction windlass device used for extruding, sucking and etching liquid on the circuit board. The water suction windlass device comprises an isolation groove, a stand firmly arranged in the isolation groove, a water suction windlass group arranged on the stand and used for extruding and sucking the liquid on the circuit board, and a transmission device arranged on the stand and used for driving the water suction windlass group to rotate axially, and moreover, the stand is provided with a water press windlass for extruding the water suction windlass group, an angle is formed between the water press windlass and the water suction windlass group, and spiral water extrusion threads are formed in the outer wall of the water press windlass. According to the water suction windlass device, the water press windlass with water extrusion threads is arranged at the oblique upper side of the water suction windlass group, the water suction windlass group is extruded through the water press windlass, the liquid sucked by the water suction windlass group is extruded towards the two ends through the water extrusion threads, the post-liquid taking phenomenon is reduced, the energy saving and emission reduction demands are satisfied, the circuit board surface oxidization chance is reduced, and the circuit board quality is improved.