The embodiment of the invention provides a cable trench cover plate. The cable trench cover plate comprises a transparent protective hood, a solar photovoltaic power generation module arranged on the inner side of the transparent protective hood, a charge and discharge control module connected with the solar photovoltaic power generation module, and a storage battery connected with the charge and discharge control module, wherein the solar photovoltaic power generation module is integrally shaped like a flat plate, and is adhered to the transparent protective hood through a light incident surface; and the charge and discharge control module stores electric energy obtained through conversion of the solar photovoltaic power generation module in the storage battery, and controls the storage battery to supply power to monitoring equipment arranged in a cable trench through a power supply port. According to the embodiment of the invention, through assembly of the solar photovoltaic power generation module on the inner side of the transparent protective hood and through corresponding arrangement of the charge and discharge control module and the storage battery, light energy can be converted into the electric energy during sunlight irradiation, the electric energy is then stored in the storage battery, and the storage battery is controlled to supply the power to the monitoring equipment arranged in the cable trench through the power supply port, so that mounting of various types of monitoring equipment in the cable trench is facilitated.