A pipe support device for a transformer is proposed. A brace having a grid shape and serving as a reinforcing member is provided on the surface of an outer housing constituting the exterior of the transformer. Supports are installed at predetermined intervals on the brace to be orthogonal thereto. A support base is positioned on each of the supports, and a pipe holder is coupled to the support base to support a pipe. An elastic supporting pad is positioned between the support base and the pipe and opposite flange portions of the pipe holder are seated on and coupled to the elastic supporting pad. An elastic close-contact pad is positioned between the pipe and an arched portion of the pipe holder and is brought into close contact with the pipe.