The utility model relates to a lower sleeve efficiency improving device which comprises a baffle arranged on a straight section of a catwalk and a supporting rod arranged on the side, deviating from an inclined section of the catwalk, of the baffle. A certain included angle is formed between the supporting rod and the baffle, one end of the supporting rod is connected with the baffle, and the other end of the supporting rod is connected with the straight section of the catwalk; reinforcing ribs are arranged on the side, deviating from the catwalk inclined section, of the baffle. The casing running efficiency improving device is simple in structure, small in size and more suitable for offshore platform operation; during operation, a casing pipe or a drill rod can be directly put down to thecatwalk plate, casing pipe putting-down or drill rod connecting operation can be conducted safely and rapidly, and the operation safety coefficient and the operation efficiency are improved.