The invention discloses a macromolecule PVC profile ladder type bridge. The macromolecule PVC profile ladder type bridge comprises two groups of ladder sides and ladder beams arranged between two groups of ladder sides in parallel; a first fixed steel, a second fixed steel and a third fixed steel are arranged at medial surfaces of two groups of ladder sides, the first sliding rails are arranged atadjacent surfaces between the first fixed steel and the second fixed steel, a first sliding bar is arranged between two groups of first sliding rails; the ladder beam is arranged on the first slidingbar on two groups of ladder sides; the second sliding rails are arranged on adjacent surfaces of the second fixed steel and the third fixed steel; a second sliding bar is arranged between two groupsof second sliding rails; the ladder beam is arranged on the second sliding bar on two groups of ladder sides, ball strips are arranged between the first sliding bar and two groups of first sliding rails and between the second sliding bar and two groups of second sliding rails. The entire length of the bridge can be increased or shortened at will in the use process, and the reserved length of the cable is convenient to adjust.