Receiving Folder with Self-Arrangement

A receiving folder comprising:

• a top cover and a bottom case to form a capacity space positioned between said top cover and said bottom case, wherein
• a pair of first side walls having first inclined edges, a pair of clamping units being formed on said pair of first sidewalls for fastening a metal card;
• a pair of second walks of said bottom case having second inclined edges, said bottom case has an elastic unit therein, wherein an end of said elastic unit extends upward to contact said inner top cover, said bottom case has at least one plate, said bottom case further comprising an electromagnetic layer;
• and
• wherein said pair of first sidewalls having first sliding elements, said pair of second sidewalls having second sliding elements, said first inclined edges are opposite to said second inclined edges, thereby said pair of first sidewalls and said pair of second sidewalls are engaged with each other by coupling of sliding elements.