Dual-purpose folding ladder

A dual-purpose folding ladder, comprising:

• a base with a plurality of casters provided under the base, wherein the base is provided with a positioning mount and has a side provided with two supporting rods;
• two guide rails each pivotally provided at, and rotatable with respect to, a corresponding one of the two supporting rods, wherein each said guide rail is provided with a positioning hole, and a connecting plate is provided between the two guide rails;
• a supporting post having an end pivotally connected to the connecting plate and an opposite end connected to the positioning mount of the base;
• two supporting arms each mounted in, and movable in an axial direction with respect to, a corresponding one of the two guide rails, wherein each of the two supporting arms is provided with a plurality of positioning holes and is secured in position to the positioning hole of the corresponding one of the two guide rails by a pin, and a plurality of rungs are provided between the two supporting arms to connect the two supporting arms such that the two supporting arms and the rungs form a ladder;
• two extension arms each provided at an end of a corresponding one of the supporting arms such that each said extension arm and the corresponding one of the supporting arms form an angle greater than 90 degrees and less than 180 degrees;
• and
• a first pad pivotally connected to the two supporting arms, wherein the first pad has a side provided with an arc-shaped positioning plate, the arc-shaped positioning plate is provided with a plurality of positioning holes, and the first pad is able to be adjusted in angle and secured in position by inserting a pin selectively through a said positioning hole of the arc-shaped positioning plate and a said positioning hole of a corresponding one of the extension arms.