The present invention is to provide a collapsible platform ladder, which comprises a pair platform decks, a pair ladder frames with telescopic hollow tubes and two pair collapsible floor feet, wherein the pair platform decks are abutted each other in linked way, the pair ladder frames are disposed on both distal outer lateral ends thereof respectively, and each pair pivotal floor feet are disposed at the ends for each ladder frame in pivotal manner respectively. In operation, telescopic hollow tubes of ladder frame can be pulled or retracted in different lengths to adjust working height, while in packing, floor feet are collapsed under ladder frames, ladder frames are collapsed under platform decks, platform decks are collapsed each other to become a compact collapsed ladder for easily storing and transportation