The utility model provides an assembly mobile platform for pile sinking, its characterized in that: it includes lays a plurality of steel -pipe piles that the direction distributes side by side along the sheet pile, and every row of steel -pipe pile top is provided with the crossbeam, the interval evenly sets up the longeron of laying the direction distribution along the sheet pile between two adjacent crossbeams, is located not set up the longeron between sheet pile construction region two marginal crossbeams, laid the panel between two adjacent crossbeams, a plurality of panels support in the walking plane of longeron upper portion and formation, have placed the crawler crane on the walking plane, and the crawler crane can normally be walked on the plane of walking, be located and do not set up the panel between sheet pile construction region two marginal crossbeams and be located the planar outside of walking, it has erect the leading truck not to be provided with between two crossbeam tops of panel. Invention atress is clear, and not influenced by the stormy waves, and the pile sinking accuracy is high and efficient.