Automatic drainage system for cable trench of transformer substation

The invention discloses an automatic drainage system for a cable trench of a transformer substation. The automatic drainage system comprises a cable trench structure, a cover board structure and a control mechanism, wherein the cover board structure is arranged on the upper part of the cable trench structure, the control mechanism is connected with the cable trench structure, the cable trench structure comprises an upper tunnel and a lower tunnel, a partitioning board is arranged between the upper tunnel and the lower tunnel, and a cable holder is arranged in the cable holder. According to the automatic drainage system, the double-layer tunnel structure is adopted, so that humus and water can be separated; the inclined partitioning board is adopted, so that water can flow into the lower tunnel as much as possible, and the contact between the humus and water is avoided; a single-chip microcomputer controller is adopted for controlling, so that the functions of draining water and absorbing moisture for the cabl