Device of double saw blades

A device of double saw blades, comprising:

• a first saw blade rotating around an rotation axis in a first direction, comprising a first blade body and a first cutting element mounting on a periphery of said first blade body;
• a second saw blade rotating around said rotation axis in a second direction, wherein said second direction is opposite to said first direction, comprising a second blade body and a second cutting element mounting on a periphery of said second blade body, wherein said second saw blade is parallel and close to said first saw blade to make said first cutting element and said second cutting element cut cooperatively;
• a driving device connecting with said first saw blade and said second saw blade axially to drive, having a driving diameter;
• and
• a security system, has a security distance provided between said first blade body and said second blade body, comprising:
• a first rigidity enhancer comprising a first saw adapter mounting on an outer side of said first blade body, wherein said first saw adapter has a predetermined first diameter to enhance rigidity of said first blade body, so as to reduce deformation of said first blade body in working, wherein said first diameter is no more than said driving diameter, and a second rigidity enhancer comprising a second saw adapter mounting on an outer side of said second blade body, wherein said second saw adapter has a predetermined second diameter to enhance rigidity of said second blade body, so as to reduce deformation of said second blade body in working, wherein said second diameter is no more than said driving diameter.