The invention provides a retractable hydraulic swing cylinder direct driving fin stabilizer device, which is characterized in that: a mounting seat is installed in a bilge part; The first hydraulic swing cylinder is fixedly mounted on the mounting seat and comprises a first cylinder body, a retracting rotating shaft, a first cylinder blade, a rotating shaft blade, and two oil ports; a connector, wherein a low end of that connector is fixedly connected with a retracting/releasing rotate shaft; a second hydraulic swing cylinder, which is fixedly connected with the upper end of the connector, andthe axial direction is perpendicular to the axial direction of the first hydraulic swing cylinder, and includes: second cylinder, a fin shaft oppositely disposed on the inner wall of the second cylinder, protruding toward the fin shaft and extending in the axial direction, two second cylinder blades oppositely disposed on the fin shaft, protruding toward the inner wall of the second cylinder block and extending in the axial direction, and two sets of oil ports provided on the second cylinder block corresponding to the two second cylinder blades; and a fin fixedly connected to the protruding end of the fin shaft.