The invention discloses a total-depth curtain freezing and water stopping system of a water and sand rich sandy gravel formation deeply-buried station excavated in a concealed mode. The total-depth curtain freezing and water stopping system of the water and sand rich sandy gravel formation deeply-buried station excavated in the concealed mode comprises a freezing curtain and a mud rock layer, wherein the mud rock layer is located at the bottom of an excavation range, the freezing curtain is arranged around the excavation range, and the bottom of the freezing curtain is arranged inside the mud rock layer.