The utility model provides a buried transformer substation. The buried transformer substation comprises an overground system and an underground system. The underground system comprises an undergroundbox body which is arranged underground and is provided with an opening; the top cover covers the opening, and a cable channel is formed in the top cover; a top cover first through hole and a top coversecond through hole which are communicated with the underground box body are formed in the top cover; the above-ground system comprises a ventilation pavilion arranged on the top cover; the ventilation pavilion comprises a ventilation box body, the ventilation box body comprises a bottom plate set and a side plate set, a cavity is defined by the bottom plate set and the side plate set, an air inlet, an air outlet and a ventilation hole set are formed in the bottom plate set, the air inlet is communicated with the first through hole and the cavity, and the air outlet is communicated with the second through hole and the cavity; and the vent hole group is communicated with the cavity. According to the buried transformer substation, natural wind is led into the underground system through theventilation pavilion, so that the underground system is cooled, and the problems of ventilation and cooling of the underground system are solved.