The present utility model relates to the electrical equipment technology field, especially to a heat dissipation structure of a box type transformer station shell. The heat dissipation structure of the box type transformer station shell comprises a heat insulation clerestory, a passageway is formed inside the heat insulation clerestory in a hollow way, an air inlet is arranged below the heat insulation clerestory, air vents are respectively arranged on two ends of the heat insulation clerestory, and an exhaust fan is arranged inside the heat insulation clerestory. In the structure, a heat flow generated by electrical equipment inside the box type transformer station shell enters into the heat insulation clerestory through the air outlet below the heat insulation clerestory, diffuses to two ends through the passageway formed inside the heat insulation clerestory in a hollow way, and diffuses outside through the air vents. As the exhaust fan is also arranged inside the heat insulation clerestory, flowing of the heat flow can be quickened, heat flow accumulated on the top part of the transformer station can be discharged outside rapidly, the structure is simple and convenient for assembling, and the heat dissipation efficiency is high.