Power shift gearbox of mining dump truck

The utility model discloses a power shift gearbox of a mining dump truck, which mainly solves the problems that the existing gearbox has many parts and a transmission line is complicated. The power shift gearbox of the mining dump truck in the utility model mainly comprises an input shaft, an output shaft and six middle shafts, wherein a clutch is respectively disposed on each of the middle shafts and a gear is also respectively disposed on each of the shafts; according to the transmission line of the shafts, the input shaft (24) and a first middle shaft (25), a sixth middle shaft (22) and a third middle shaft (19) are arranged in a quadrangle-shaped manner, the input shaft (23) is also arranged in a quadrangle-shaped manner with a second middle shaft (18), a fifth middle shaft (21) and the third middle shaft (19), and the output shaft (23) is arranged in a quadrangle-shaped manner with the fifth middle shaft (21), the third middle shaft (19) and a fourth middle shaft (20). In transmission with application of