The invention discloses a valve rod supporting device. the valve rod supporting device comprises a supporting assembly and an anti-abrasion assembly, wherein the supporting assembly comprises a supporting sleeve barrel and a connecting plate, one end of the supporting plate is connected with a fixed frame of a boat body, and the other end of the supporting plate is fixedly connected with the supporting sleeve barrel; and the anti-abrasion assembly comprises a flexible anti-abrasion bushing, the anti-abrasion bushing is connected with the supporting sleeve barrel, and is attached with the inner wall of the supporting sleeve barrel, and the inner diameter of the anti-abrasion bushing is matched with a valve rod. By arranging the anti-abrasion bushing in the supporting sleeve barrel, the flexible anti-abrasion bushing is in direct contact with the valve rod so that damage of coatings on the valve rod and a valve rod body made by the valve rod supporting device can be reduced, the service life of the valve rod is prolonged, the operability of valve pieces is improved, and the replaceability of the valve rod supporting device is improved.