The invention discloses a multi-stage folding hydraulic dam. The dam comprises a base and a dam body, wherein an equipment pit is excavated in the downstream direction of the dam body, the dam body isdivided into at least two stages of dam bodies, the adjacent stages of dam bodies are movably connected, a sliding groove is formed in the equipment pit, movable bases are movably arranged on the sliding groove, a hydraulic cylinder is vertically arranged on each movable base, and the top output end of each hydraulic cylinder is movably connected with the downstream side edge of the correspondinggraded dam body. A water-blocking film assembly covers the equipment pit. The multi-stage folding hydraulic dam has the advantages that independent turnover of each stage of dam body is achieved, sothat water pressure resistance borne by the dam bodies can be reduced through step-by-step turnover when the dam bodies are opened or closed, and the process of opening or closing the dam bodies is more stable; more labor is saved in the jacking process when the dam body is horizontally laid down, and the requirement on a hydraulic cylinder is lowered; damage to equipment such as a hydraulic cylinder and a sliding groove caused by water flowing over the dam body is effectively avoided, and the service life of the equipment is prolonged; the water blocking effect of the whole dam body is good.