A chain-shaped foldable cellphone capable of expanding functions and changing shape during usage comprises a mainframe module, a display module, more than one dual-spindle connecting block and an expansible module or an extensive module, wherein the extensive module is a complementary connector of the expansible module, and the neighboring ends of the two modules can be connected mutually while the distant ends thereof can be connected to one of the spindles of one dual-spindle connecting block respectively; by using the pivotal connection of the dual-spindle connecting block, the mainframe module is pivotally connected to the display module, and a plurality of extensive module and expansible module of various functions can be further pivotally connected to construct a chain-shaped foldable cellphone.