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The invention relates to an efficient recycling device and process for hollow particles in ash residues in an ash storing yard and a storage yard of a power station. The device comprises a crusher, a screw feeder, a mortar stirring tank, a water cement ratio monitoring-feedback-control system, a buffering water tank, a circulating water pump and an ash yard water return pipeline, wherein purifying-grading-upgrading devices are connected to a collection tank and a water return tank. The process comprises the following steps: (1) crushing the ash residues in the ash storing yard and the storage yard of the power station, mixing the ash residues with returned water; (2) carrying out concentration stabilization on high-concentration grout; (3) conveying the high-concentration grout to a distribution-collection tank through a slurry pump and a manual regulating valve; (4) enabling overflow water and bled water in a dewatering bin to automatically flow into a concentrator; (5) enabling a mixture of floating bead particles and water in the collection tank to pass through the purifying-grading-upgrading devices; (6) enabling the overflow water in the concentrator to automatically flow into the buffering water tank; (7) enabling high-concentration residue slurry discharged from the bottoms of the concentrator and the buffering water tank to continuously enter the dewatering bin to be recycled. According to the efficient recycling device and process, the comprehensive utilization level of the ash residues in the storage yard is effectively improved.