The utility model discloses a combination connecting device of an
underwater horizontal container, the combination connecting device of the
underwater horizontal container comprises a
saddle and a supporting seat, the horizontal container is arranged between the supporting seat and the
saddle, the horizontal container respectively abuts against the
saddle and the supporting seat, the saddle and the supporting seat are both connected with rib plates, and the rib plates are connected with the saddle and the supporting seat. The ends, away from the saddle and the supporting base, of the rib plates are connected to the
bedroom container, a floating plate is connected between the saddle and the supporting base, and the sides, away from the
bedroom container, of the saddle and the supporting base are connected through a reinforcing ring so that the saddle and the supporting base can be fixedly connected to the
bedroom container. According to the combined connecting device of the
underwater horizontal container, the saddle is arranged on the bedroom container, so that the bedroom container is stably arranged underwater, the supporting seat is arranged on the bedroom container, so that the operation platform is supported, the floating plate is connected between the saddle and the supporting seat, and the supporting seat is arranged on the supporting seat. The gravity of the heavy object on the operating platform is transmitted to the saddle from the supporting seat, and the gravity of the heavy object on the operating platform transmitted to the outer wall of the horizontal container is reduced.