The utility model discloses a fastener for cascaded binding post, it includes the spanner, pulls handbag and draws together the spanner head for drive the rotatory first member of spanner head, the second member and be used for making first member and the second member between the universal subassembly of universal pivoted, the one end of first member is connected on the spanner head, the other end of first member is connected with the second member through universal subassembly. Connect two members through universal subassembly, adjusting wrench length that can be nimble can be fastened underthe limited circumstances in space, and at the in -process of fastening terminal, the spanner can not lead to the fact to push away and pull the phenomenon the wiring of adjacent terminal.