The utility model discloses a self-cooling circulation axial-force bearing device for a horizontal pump. The self-cooling circulation axial-force bearing device comprises a transmission shaft connected with a pump shaft. A connection piece, a thrust bearing unit and a tail end cover are sequentially connected to the transmission shaft from left to right in a sleeved mode. The thrust bearing unit comprises a front bearing base, a front bearing, a sliding block, a thrust bearing fan-shaped block, a thrust bearing supporting frame and a rear bearing base which are sequentially arranged from left to right, wherein the front bearing, the sliding block, the thrust bearing fan-shaped block, the thrust bearing supporting frame and the rear bearing base are matched with the front bearing base. The right end of the thrust bearing supporting frame is provided with a curved surface circular table, and the left end face of the rear bearing base is provided with a concave face matched with the curved surface circular table. A lubricating sleeve and a cooling sleeve are fixedly connected between the front bearing base and the rear bearing base from inside to outside in the radial direction in sequence, and a lubricating containing cavity and a cooling containing cavity are sequentially formed from inside to outside; the cooling liquid is circulated between the interior of the cooling containing cavity and a suction flange. The self-cooling circulation axial-force bearing device can bear the axial force, self-cooling circulation between the interior of the cooling containing cavity and the interior of the pump body is achieved, service life of the bearing device is prolonged, and the application range of the bearing device is broadened.