Automatic drainage system for cable trench accumulated water

The invention provides an automatic drainage system for cable trench accumulated water. The automatic drainage system comprises a filtering water channel and a precipitating water channel, wherein the filtering water channel is arranged below a cable trench, the precipitating water channel and the filtering water channel are arranged side by side, a vertical pipeline is arranged between the filtering water channel and the cable trench, and a transverse pipeline is arranged between the filtering water channel and the precipitating water channel. The automatic drainage system further comprises an accumulated water detector, a control device, a drainage pump, a drainage pipe and a water collecting well, wherein the accumulated water detector is fixedly installed on the bottom surface of the cable trench, the accumulated water detector is electrically connected with the control device, and the control device is electrically connected with a switch of the drainage pump; the drainage pump is arranged on the side wa