Isolator platform maintenance ladder, the transformer that relates to an electric power system overhauls the climbing instrument of ascending a height. In order to solve when isolator's the maintenance operation, there is certain potential safety hazard, crane operation nimble problem inadequately in the use of ladder. The equal vertical setting of stand, footboard crossbeam are fixed on the lateral wall of stand, the operation footboard is fixed on the footboard crossbeam, the protection frame is opened actinal both ends and is connected respectively on a stand to, the protection shelf energy enough rotates around the tie point, no. Three the stand is continuous with the bottom of a stand and no. Two stands respectively, it fixes respectively on no. Three adjacent stands to connect the crossbeam, a fixed cross beam fixes in the bottom of two no. Three adjacent stands, and another fixed cross beam fixes the bottom at other two no. Three adjacent stands. It is high that this novel beneficial effect is the security performance, the flexible operation. Be applicable to and fix on the isolator's that will overhaul framework.