Reversing gear box of agricultural and forestry machinery

An agricultural and forestry machinery reversing gear box belongs to the technical field of agricultural and forestry machinery. Comprising a shell, a long shaft assembly and a short shaft assembly, the long shaft assembly comprises a long shaft, the long shaft transversely penetrates through the shell, the left end and the right end of the long shaft extend out of the shell, a long shaft bevel gear is arranged at the left position of the middle of the long shaft, and a left bearing and a left sealing ring are sequentially arranged on the left side of the long shaft bevel gear; the short shaft assembly comprises a short shaft, the short shaft is perpendicular to the long shaft, the rear end of the short shaft extends out of the shell from the rear side wall of the shell, a short shaft bevel gear is arranged at the front end, facing the long shaft, of the short shaft, the short shaft bevel gear is meshed with a long shaft bevel gear, and the long shaft bevel gear is meshed with the short shaft bevel gear. An o