A seamless attached tent includes an inner tent and an outer tent. The inner tent includes a tent cloth, one or more tent rods, and a base cloth. The tent cloth includes a plurality of cloth pieces and a plurality of adhesive layers, and adjacent cloth pieces of the plurality of cloth pieces are attached together through the plurality of adhesive layers. The one or more tent rods are connected to a periphery of the tent cloth. The base cloth is disposed on a lower side of the tent cloth. All sides of the base cloth extend upward to form a surrounding barrier. Corners of the surrounding barrier are attached with reinforcing blocks through the plurality of adhesive layers. The outer tent covers a top of the inner tent.