value with opposite directions the front swinging jaw 4 is connected to the eccentric bearing guards 19 of the front eccentric driving shaft 15 the rear swinging jaw 8 is connected to the eccentric bearing guards 19 of the rear eccentric driving shaft 14 the concentric bearing guards 19 of the front eccentric driving shaft 15 and the rear eccentric driving shaft 14 are mounted on the frame the front driving gear 21 is cased around the reference guards 16 of the front eccentric driving shaft 15 the rear driving gear 13 is cased around the reference guards 16 of the rear eccentric driving shaft 14 the movable jaw plate 5 is mounted on the front swinging jaw 4 the fixed jaw plate 6 is mounted on the frame 1 an adjusting bolt 12 is provided on the frame 1 the adjusting bolt 12 is connected to the rear bracket 9 a connecting rod 10 is connected to the bottom rear of the front swinging jaw 4 the connecting rod 10 is connected to the frame 1 through a buffer spring 11 the jaw crusher according to the present invention comprises two complete and individual crank rocker mechanisms wherein a in the front crank rocker mechanism the front eccentric drive shaft 15 is a crank the front swinging jaw 4 is a connecting rod and the front bracket 7 is a rocker and b in the rear crank rocker mechanism the rear eccentric drive shaft.