The utility model provides a bracing piece for safety belt, includes insulator spindle, fixed subassembly and line cover subassembly, should fix the unit mount in this insulator spindle bottom with fixed insulator spindle, this line cover subassembly is fixed in on the insulator spindle and is equipped with the steel wire line of rolling, and this steel wire line end can be by the pull after -fixing for hanging a safety belt. The utility model discloses enable the maintainer and overhauing the isolator in -process, need not to unfix the safety belt and shift, it is whole under the reliable protection of safety belt, can shorten repair time simultaneously, improve maintenance efficiency.