The utility model relates to a cable worker well and drainage device thereof, the ventilation pipe is laid on the next door of cable worker well, and cable worker well links to each other with the ventilation pipe, the bottom of cable worker well continues to deep -cut out heavy jumping pit downwards, the perforated plate is established to the top lid in heavy jumping pit, the well lid is established to the top lid of cable worker well, heavy jumping pit installation relief sewer way, relief sewer says and connects the sump pit, installation drainage level sensor in the sump pit, alarm level sensor, the water pump, the outlet pipe of water pump divide into first branch road and second branch road, install first drain valve on the road for first, greenbelt sprinkler irrigation system is connected to first branch road, the highest second drain valve that sets up of second branch road, municipal drainage system is connected to the second branch road. The utility model discloses can prevent ponding in the cable worker well, prevent that the sand from getting into to stop up the water pump in the sump pit that ponding can directly be arranged among the municipal drainage system or be used for the greenbelt of spraying to the humiture is stable in can keeping cable worker well, better protection of cables.