Quick-assembly and quick-disassembly transmission box

A fast-assembly and fast-disassembly transmission box comprises a transmission structure, a fixing structure and a shell structure, the transmission structure comprises a main transmission structure and an auxiliary transmission structure, the main transmission structure comprises a first gear and a transmission part, the first gear is provided with a square hole, and the transmission part is provided with a connecting position and a first rack; the fixing structure comprises a fast-assembling structure and a handle fixing structure, the fast-assembling structure comprises a first elastic piece, a second elastic piece and a sliding piece, and the sliding piece is provided with a first sliding groove allowing the connecting position of the transmission piece to be inserted in; the first gear and the transmission part are in meshing transmission, and the sliding part moves along with the transmission part to enable the first elastic part and the second elastic part to pop out to fasten the door and window. The