The present invention is an invention of a bridge work cart and a pipeline construction method using the same, and more particularly, an invention for a technology that can quickly and safely install a pipeline under a bridge using a bridge work cart suspended under the bridge. Specifically, in the bridge work cart for installing the water pipe under the girder of the bridge, the bridge work cart of the present invention is located on the lower side of the bridge, runs along the bridge, and consists of a support 110 formed in a plate shape. (100); A driving unit 200 driven along the guide rail 10 of the bridge and coupled to the bogie unit; A moving part 300 formed on an upper surface of the cart part and moving the moving worktable vertically and/or horizontally; It consists of a main configuration including; a power unit 400 made of a power device for driving the balance unit 100 and/or the moving unit 300.
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