The utility model relates to a fill flowing back valve for cable perforation ware, including valve body and chemical hot reaction unit, have on the valve body that the structure is introduced to the electrode and to the topping up structure of cable perforation ware topping up, the chemistry hot reaction unit be connected with the valve body, the electrode is introduced the structure and is included outer electrode mounting hole, inner electrode mounting hole and the inner electrode installation body, outer electrode mounting hole and valve body axis have 30 - 120 contained angle, and the both ends of outer electrode mounting hole are installed the outer electrode respectively and are drawn forth the body, inner electrode mounting hole and outer electrode mounting hole intercommunication, the tip in electrode mounting hole including the inner electrode installation body is fixed, the hot reaction unit of chemistry includes metal mesh pipe, and the intraductal chemical reaction material water proof bag that is equipped with of this metal mesh should reaction be expected to be equipped with in water proof bag and is got angry the head. Simple structure, low in production cost, convenient fixed inner electrode, dispatch from foreign news agency level and connection. Still convenient inner chamber, exocoel notes liquid and maintenance flowing back of annotating liquid to the cable perforation ware simultaneously.