The utility model relates to a solar steel greenhouse, which belongs to the field of solar photovoltaic power generation application technology. The solar steel greenhouse comprises a photovoltaic cell roof (1), a steel truss (2) and a cob wall (3). The steel truss is arranged on the cob wall, the photovoltaic cell roof is obliquely arranged on the steel truss and forms an included angle of 5 degrees to 19 degrees with the horizontal plane, the cob wall is obliquely arranged in the vertical direction, and the surface of the cob wall is uneven. The solar steel greenhouse has the advantages that wave bands required by plants growing under the sunlight penetrate through a solar cell on the roof of the agricultural greenhouse and are absorbed by the plants, and wave bands which is not required by plant growing are partially absorbed by the solar cell to be used for generating electricity and are partially converted into heat energy to heat the agricultural greenhouse. The solar steel greenhouse can control temperature, humidity and intensity of illumination in the greenhouse and adjust the environment of plant growing according to the requirements of the plant growing by changing arrangement mode of a cell assembly.