Ship model motion restraining device for hydrodynamic test

The invention relates to a motion restraint device, in particular to a ship model motion restraint device for a hydrodynamic test, and the device is characterized in that a first part of the ship model motion restraint device comprises a first bracket, a hinge ball head, a ball head hinge seat, a locking nut and a first connecting piece, wherein a columnar connecting part of the hinge ball head isfixed on the first bracket at the middle, the ball head part is hinged into a hinge cavity of the ball head hinge seat; the locking nut is screwed in along a bus from the upper bottom surface to thelower bottom surface of the ball head hinge seat; the first connecting piece is fixed with the upper bottom surface of the ball head hinging seat; and a second part comprises a second bracket, a cylindrical connecting piece and a second connecting piece, a stud of the cylindrical connecting piece is centrally fixed on the second bracket, and a cylindrical nut of the cylindrical connecting piece isfixed with the second conn