A paper-made composite pet house comprises a rigid bottom cardboard, at least one cardboard support wall connected to the rigid bottom cardboard, a cardboard cover, a top coupling wall and at least one viewing tower. The rigid bottom cardboard has a first coupling portion. The cardboard support wall has a second coupling portion connecting to the first coupling portion and a plurality of top coupling portions remote from the rigid bottom cardboard. The cardboard cover is remote from the rigid bottom cardboard and connected to the top coupling portions to form a mask cover. The top coupling wall and viewing tower are located on the cardboard cover. Thus the invention allows users to assemble by themselves and is flexible in shape. It also is eco-friendly, and can be assembled quickly and fabricated at low cost to provide improved practicality.
