The invention discloses a tool for fixing a lead wire during charged replacement of a pin type porcelain bottle of a 10 kV distribution network line. The tool comprises a compound supporting column insulator, as well as a lead wire fixture and a cross arm fixture which are respectively connected to two ends of the compound supporting column insulator, wherein the lead wire fixture is a U-shaped fixture with a self-locking component; the cross arm fixture is a C-shaped fixture; the lead wire is arranged in an opening of the U-shaped fixture and is locked by the self-locking component; the C-shaped fixture clamps a cross arm; the C-shaped fixture and the cross arm are detachably connected through a fastening assembly to form a whole. The lower end of the tool is directly and detachably fixed on the cross arm on the pin type insulator to be replaced; an overhead lead wire is locked by the lead wire fixture at the upper end of the tool instead of being fixed by external equipment. The cross arm fixture is detachably connected with the cross arm, so that the tool can be simply and quickly assembled and disassembled; the lead wire fixture can also lock the lead wire conveniently and quickly through the self-locking component; furthermore, the tool occupies a small space after being mounted; therefore, the aims of high efficiency, safety and university are fulfilled.