Cable trench drainage device

The invention discloses a cable trench drainage device. Comprising a water-collecting well arranged beside a cable trench, a water outlet arranged at the bottom of the cable trench and communicated with the water-collecting well, a submersible sewage pump arranged at the bottom of the water-collecting well and provided with a downward suction inlet, a second liquid level switch arranged on the well wall of the water-collecting well and a first liquid level switch arranged on the well wall of the water-collecting well. A water outlet pipe of the submersible sewage pump is in the horizontal direction and connected with a drainage pipe, and the drainage pipe is communicated with an external rainwater pipeline. Accumulated water in the cable trench can be discharged into the water collecting well in time and then is automatically discharged into the rainwater pipeline through the submersible sewage pump, so that no accumulated water exists in the cable trench, and normal operation and service life of cables in th