Folding primary and secondary ladder

The utility model discloses a folding primary and secondary ladder belongs to the folding ladder among the civil engineering technical field, and its aim at provides a folding primary and secondary ladder. Its technical scheme does: including preceding support frame and back support frame, preceding support frame and back all are equipped with the horizontal pole on the support frame, are equipped with the roof between the top of preceding support frame and the top of back support frame, and the both ends fixedly connected with articulated shaft of roof, preceding support frame and back support frame pass through the articulated shaft and hinge and connect on the roof, prevent that the favourable turn constructs in the preceding support frame before being provided with, be provided with the rear defence favourable turn in the back support frame and construct, still include vice adjustment mechanism of screw -nut and set up in the walking wheel and the lift supporting mechanism of the bottom of the second body