The invention provides a work-exchange type energy recovery device in order to achieve the stable pressure-based energy exchange by motor drive, end-plate flow distribution and self-tight sealing. The energy recovery device comprises a rotating component and a non-rotating component, wherein the rotating component comprises a driving shaft, an upper driving disc, a driving pipe, a lower driving disk and a driven shaft which are fixed relative to each other and securely connected. The energy recovery device of the invention belongs to a work-exchange type energy recovery device, wherein according to the principle of pressure exchange, the energy recovery device is mainly made of novel macromolecular wear-resistant engineering plastics and corrosion-resistant stainless steel materials, particularly the flow distribution surface, which constitutes a key part of the energy recovery device, is based on the self-developed self-tight sealing structure and the water-lubrication static-pressure supporting technology, thus avoiding the leakage from the high-pressure flow distribution surface; and combined with the scheme to drive the energy recovery device by the low-rate motor, the energy recovery device has the advantages of high efficiency, high safety and stability, small size, long service life and low noise.