A high-capacity juice extractor comprising: a base; first and second supports (230 and 250) which are spaced apart from each other in a longitudinal direction, and are provided on the base; a first extracting member which is a hollow cylinder opened toward the second support, is positioned between the first support and the second support, is rotatably supported on the first support by an outer casing support shaft, and is formed with a plurality of outlet ports; a second extracting member which is rotatably supported on the second support by an inner casing support shaft which is eccentric to the outer casing support shaft, and is positioned in the first extracting member to be eccentric to the first extracting member; and a driving member configured to drive at least one of the first extracting member and the second extracting member, characterized in that the first extracting member includes an outer casing gear, the second extracting member includes an inner casing gear which is meshed with the outer casing gear, and the first extracting member and the second extracting member are rotated by gear engagement of the outer casing gear and the inner casing gear, an opened end of the first extracting member is provided with an annular member which is made of a semicircular plate to expose an inner upper portion of the first extracting member, and the annular member has a first annular member, two second annular members and a third annular member; the first annular member is positioned at an outside of the outer casing gear and the inner casing gear; the third annular member is spaced apart from the first annular member, is positioned in an inside in the longitudinal direction, and is positioned in the side of the outer casing gear and the inner casing gear, and an annular portion of the third annular member coincides with an inner diameter of the outer casing; and the second annular members are interposed between the first annular member and the third annular member, such that the inner casing gear is interposed between the second annular members, and an annular portion of the second annular member coincides with an inner diameter of the first extracting member. a base; first and second supports (230 and 250) which are spaced apart from each other in a longitudinal direction, and are provided on the base; a first extracting member which is a hollow cylinder opened toward the second support, is positioned between the first support and the second support, is rotatably supported on the first support by an outer casing support shaft, and is formed with a plurality of outlet ports; a second extracting member which is rotatably supported on the second support by an inner casing support shaft which is eccentric to the outer casing support shaft, and is positioned in the first extracting member to be eccentric to the first extracting member; and a driving member configured to drive at least one of the first extracting member and the second extracting member, characterized in that the first extracting member includes an outer casing gear, the second extracting member includes an inner casing gear which is meshed with the outer casing gear, and the first extracting member and the second extracting member are rotated by gear engagement of the outer casing gear and the inner casing gear, an opened end of the first extracting member is provided with an annular member which is made of a semicircular plate to expose an inner upper portion of the first extracting member, and the annular member has a first annular member, two second annular members and a third annular member; the first annular member is positioned at an outside of the outer casing gear and the inner casing gear; the third annular member is spaced apart from the first annular member, is positioned in an inside in the longitudinal direction, and is positioned in the side of the outer casing gear and the inner casing gear, and an annular portion of the third annular member coincides with an inner diameter of the outer casing; and the second annular members are interposed between the first annular member and the third annular member, such that the inner casing gear is interposed between the second annular members, and an annular portion of the second annular member coincides with an inner diameter of the first extracting member.