The invention provides a three-way limiting device of an independent liquefied gas ship liquid cargo tank and belongs to the technical field of ship liquid cargo tank limiting. The three-way limiting device of the independent liquefied gas ship liquid cargo tank comprises an integrated supporting assembly, a horizontal supporting plate, a horizontal laminated wood assembly, first toggle plates, a supporting assembly and vertical laminated wood assemblies, wherein the integrated supporting assembly, the horizontal supporting plate and the horizontal laminated wood assembly are arranged on one side of a main ship body; and the first toggle plates, the supporting assembly and the vertical laminated wood assemblies are located on one side of the liquid cargo tank. The integrated supporting assembly is arranged perpendicular to the plane of the main ship body, the horizontal supporting plate is arranged on the supporting assembly, the side, away from the integrated supporting assembly, of the horizontal supporting plate is provided with the horizontal laminated wood assembly, and limitation of the main ship body in the vertical direction is achieved; the side, away from the horizontal supporting plate, of the horizontal laminated wood assembly is provided with the supporting assembly, the vertical laminated wood assemblies are arranged between the four sides of the supporting assembly and the integrated supporting assembly, the effect that the supporting assembly is limited in the transverse direction and in the longitudinal direction is guaranteed, and limitation of the liquid cargo tank in the other two directions is achieved; and a three-degree-of-freedom limiting device is arranged, limitation is achieved in a limited space, and the space utilization rate is high.