The utility model discloses a long span's anti -dazzle separation net of highway belongs to the structural design field of anti -dazzle net or rail guard, relates to the application technique of glass steel for shading or two sides of a road's isolative protection in the middle of the highway, including setting up the frame that mainly montant and last horizontal pole, sheer pole are constituteed about by between two adjacent stands and setting up a plurality of isolated gates that vertical isolating rod constitutes in the frame, have at least in the last horizontal pole of isolated gate or the sheer pole one for arching shape, perhaps when last horizontal pole and sheer pole are straight shape, be provided with the rib of an at least arching between last horizontal pole and the sheer pole. The utility model provides an easy flagging problem of anti -dazzle separation net, make the spacing distance extension between the adjacent stand to advantage such as have that the durability is good, the processing cost is hanged down, installation and the structure be convenient for is succinct pleasing to the eye.