Caterpillar tractor gearbox and caterpillar tractor

The invention discloses a caterpillar tractor gearbox with an automated manual transmission and a caterpillar tractor. The caterpillar tractor gearbox comprises a gearbox body, and an inputting shaft driven by power is arranged on the gearbox body. The caterpillar tractor gearbox is characterized in that the inputting shaft is connected with a left planetary gear mechanism and a right planetary gear mechanism via a main speed shifting mechanism and an auxiliary speed shifting mechanism; the main speed shifting mechanism comprises a walking continuously variable transmission and a mechanical gear shifting box which are mounted on two sides of the gearbox body; the inputting shaft is respectively connected with an inputting shaft of the walking continuously variable transmission and an inputting shaft of the mechanical gear shifting box; an outputting shaft of the walking continuously variable transmission and an outputting shaft of the mechanical gear shifting box are connected with the left planetary gear mec