Centering measurement device for stern tube of long shafting ship

The utility model provides a long shafting ship stern tube centering measuring device, which comprises a bottom plate, a top plate, a measuring base and a laser receiver, the two sides of the bottom of the bottom plate are contacted with the inner wall of the stern tube through supporting pieces, the top of the top plate is contacted with the inner wall of the stern tube through a jacking piece, and the laser receiver is arranged on the measuring base. At least two vertical sliding rods which are distributed side by side are fixed between the bottom plate and the top plate, a measuring base is connected to the adjacent vertical sliding rods in a sliding mode, a rotating piece and a sliding piece which slides in the radial direction of the stern tube are arranged on the measuring base, and the measuring base is movably connected with the back side of a laser receiver through the rotating piece and the sliding piece in sequence. And the outer side of the laser receiver is in contact with the inner wall of the s