An assembled pet toy device (1) includes a base (10), a post assembly (50) and a plurality of lateral cylinders (32). The base (10) includes a plurality of first plates (12) are stacked one upon another, and the post assembly (50) is disposed on a top surface of the base (10). The post assembly (50) includes a plurality of first assemblies (20) and a plurality of second assemblies (30). The plurality of first assemblies (20) includes a plurality of second plates (21), and the plurality of second assemblies (30) includes a plurality of third plates (31). The plurality of lateral cylinders (32) is disposed on a side surface of the plurality of second assemblies (30), and the plurality of lateral cylinders (32) includes a plurality of fourth plates (34) stacked one upon another. The first plates (12), the second plates (21), the third plates (31) and the fourth plates (34) are respectively corrugated paper plates.
