The invention discloses a drying system for microbial fermented feed. The drying system for the microbial fermented feed comprises a primary drying bin, a drying platform, a hot air device, a secondary drying bin, a first transporting pipeline, a first exhaust fan and a second exhaust fan, wherein the drying platform is arranged in the primary drying bin, and a plurality of air outlets which are uniformly distributed and penetrate through up and down are formed in the drying platform; the hot air device is used for supplying hot air to the drying platform from bottom to top through the air outlets; the secondary drying bin is cylindrical, three heating walls are arranged in the secondary drying bin, the three heating walls are evenly distributed relative to the central axis of the secondary drying bin, the internal space of the secondary drying bin is divided into three fan-shaped drying cavities by the three heating walls, and each heating wall is provided with a heating part; one endof the first transporting pipeline communicates with the upper part of the primary drying bin, and the other end of the first transporting pipeline communicates with the lower part of the secondary drying bin; the first exhaust fan is arranged in the first transporting pipeline; and the second exhaust fan is arranged on the upper part of the secondary drying bin. Caking of the fermented feed is avoided, and the drying efficiency is improved.