Air distribution duct of disc koji-making machine and disc koji-making machine

The invention discloses an air distribution duct of a disc koji-making machine and the disc koji-making machine. The air distribution duct comprises a main air duct and two branch air ducts, the main air duct is provided with an air inlet end and an air outlet end which are oppositely arranged, and the air inlet end of the main air duct is connected with a fan; the two branch air ducts are connected to the air outlet end of the main air duct, and the two branch air ducts are arranged at a first preset angle, so that a small amount or part of air exhausted by the fan can enter the two branch air ducts along the main air duct; each of the main air duct and the two branch air ducts comprises two top plates connected with each other and two side plates arranged on the two sides of the two top plates and connected with the two top plates respectively, the two top plates are connected at a second preset angle, and the two side plates extend in the longitudinal direction; the two top plates and the two side plates a