The invention discloses a high-voltage lead middle peeling device which comprises a variable transmission mechanism, a clamping mechanism, a peeling mechanism and a cutoff mechanism, wherein two pairsof bevel gears which are not meshed simultaneously are arranged on the variable transmission mechanism and are used for changing power transmission routes; the clamping mechanism mainly comprises a clamping plate, a clamping column, a threaded knob, a moving transmission tank, a fixed transmission tank and a spiral rod and is used for reliably clamping a cable; the peeling mechanism mainly comprises a worm and gear transmission mechanism, a positive gear transmission mechanism, a cutting knife, a transmission rod and a screw rod shaft and mainly enables the cutting knife to cut opposite mother wires with target length on two sides of the cable; and the cutting mechanism mainly comprises a mold, a cut mold sleeve and a cutoff cutter and enables the cutoff cutter to cut off two ends of thelength part cut by the cutting knife in sequence. The high-voltage lead middle peeling device disclosed by the invention is relatively simple in peeling principle, reasonable in structure, convenientto operate, high in security and applicable to peeling of external insulating sheaths of cables of different models.