The utility model relates to an insulator is hung and is a little singly changed two cross arm fixers, including connecting seat and adjustment mechanism, the connecting seat includes first connectingseat and second connecting seat, adjustment mechanism is including the first joint that connects gradually, first lead screw, the control tube, second lead screw and second connect, rotating -barrelis revolved in the setting of control tube outer wall, set up the handle soon on the rotating -barrel, first connecting seat and second connecting seat one side dorsad all set up U -shaped string groove, the articulated fixed plate of outside lower extreme in groove is hung to the U -shaped, the other end of fixed plate rotates connects a fixing bolt, first connecting seat and second connecting seat one side lower extreme in opposite directions all set up the recess, a setting of recess downside edge and a fixing bolt assorted U -shaped block portion, first connecting seat and second connecting seat one side upper end in opposite directions set up the U -shaped spread groove respectively, and difference first joint of block and second connect in the U -shaped spread groove of first connecting seat and second connecting seat. The utility model discloses fixer simple structure, it is convenient to adjust, fixed firm to the cross arm.