The present invention discloses an outdoor solar transformer box, and belongs to the technical field of a transformer box. The transformer box mainly comprises a box body; a box cover is arranged on the top of the box body; a base is arranged at the bottom of the box body; and an electric element is arranged in the box body. The box cover on the top of the box body is provided with a solar photovoltaic panel; a solar controller and a storage battery are arranged on one side in the box body; the solar controller is respectively connected with the solar photovoltaic panel and the storage battery; the top in the box body is provided with a bracket; the bracket is provided with more than two fans; the fans are connected with the solar controller; and a protective net is provided below the fans. The invention has a simple structure, utilizes the characteristic that the outdoor transformer box is exposed to the outdoors for a long time, effectively reduces the energy consumption while improving the heat dissipation effect, and improves the safety and reliability of the transformer box. The invention is mainly used for transforming the voltage and current of electrical energy.