The utility model provides a hydraulic non-contact overrun clutch which comprises an outer ring and an inner ring, wherein the outer ring is connected with an output shaft, and the inner ring is connected with an input shaft; a wedge block is restrained in a working surface of the outer ring by virtue of a support ring, so that one-way action is realized; a baffle is arranged on the end surface of the outer ring so as to prevent the wedge block from shifting; a bearing is isolated from the wedge block by virtue of an outer retainer ring; an oil cylinder, an oil pipe and the like form a lubricating device. In operation, the oil pump presses lubricating oil into the bottom of the wedge block, so that non contact is realized. The hydraulic non-contact overrun clutch has the advantages that the overrun clutch is applicable to high-speed separation and combination in multiple driving occasions; by virtue of a hydraulic non-contact design, the service life of the clutch is greatly prolonged; by virtue of the built-in hydraulic oil pump, frequent lubrication oil maintenance is avoided, and the service lives of the bearing and the wedge block are greatly prolonged.