NOVELTY - The device comprises a solar energy hot air device (1), a three-way valve (2), an electric heating hot air device (3), a main pipeline (4), a hot air divergence device (5), a fermenting tank, a fermentation tank cover, a radiating tube seat, a radiating pipe, a spiral hole, a pipe joint, and a distributed divergent hole. The radiating pipe is provided with the distributed divergent hole, radically and uniformly formed on the radiating tube seat. The spiral hole is set on the radiating tube seat. The pipe joint is set with the spiral hole of the radiating tube seat.    USE - The device is useful for controlling temperature of fermentation of straw fertilizer.    DETAILED DESCRIPTION - The device comprises a solar energy hot air device (1), a three-way valve (2), an electric heating hot air device (3), a main pipeline (4), a hot air divergence device (5), a fermenting tank, a fermentation tank cover, a radiating tube seat, a radiating pipe, a spiral hole, a pipe joint, and a distributed divergent hole. The radiating pipe is provided with the distributed divergent hole, radially and uniformly formed on the radiating tube seat. The spiral hole is set on the radiating tube seat. The pipe joint is set with the spiral hole of the radiating tube seat to form the hot air divergence device. The hot air divergence device is installed on a bottom of the fermenting tank. An upper part of the fermenting tank is provided with the fermentation tank cover. The hot air divergence device through the radiating tube seat of the pipe joint is connected with the main pipeline. The three-way valve is arranged on the upper pat of the main pipeline. The solar energy hot air device and the electric heating hot air device are connected with the three-way valve.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a device for controlling temperature of fermentation of straw fertilizer.    Solar energy hot air device (1)    Three-way valve (2)    Electric heating hot air device (3)    Main pipeline (4)    Hot air divergence device. (5)