Double-roller two-gear transmission case and double-longitudinal-axial-flow harvester

The invention provides a double-roller two-gear transmission case and a double-longitudinal-axial-flow harvester. An input shaft of the double-roller two-gear transmission box is installed in an input two-gear box assembly, a first-gear driving gear and a second-gear driving gear are installed on the input shaft, a shifting fork shaft is installed in the input two-gear box assembly, a shifting fork is installed on the shifting fork shaft and connected with a meshing sleeve, and a second shaft is installed in the input two-gear box assembly and an output box assembly. The meshing sleeve, the first-gear driven gear and the second-gear driven gear are installed on the second shaft, the first-gear driven gear is meshed with the first-gear driving gear, the second-gear driven gear is meshed with the second-gear driving gear, the second output driven gear is installed on one output shaft, the first output driven gear is installed on the other output shaft, and the normally-meshed driving gear is installed on the se