A paper coffin is an architecture made of corrugated cardboards, including a main body, a lid and two flat-panels. The structure of main body and lid are both identical, formed by folding a large cardboard and placing with two each long and short paperboards. Without the use of a nail or screw, a paper coffin can be erected. Moreover, laying two flat-panels of different direction honeycomb arrangement inside the main body increases the capability of the main body to carry. Because when shipped from the factory, the paper coffin is in a flattened condition and vacuum packaging, it can save a lots stocking space. The users do not need to use any glue or tape to assemble, so the assembly is not only simple, fast, and also has a cost-saving and environmental protection concept.