Heavy vehicle gearbox with dual brakes

The invention discloses a heavy vehicle gearbox with dual brakes. The gearbox comprises a power input part, a brake part, a main gearbox part and a tail box part, the power input part comprises an input flange, a main input shaft, a main input gear, a first input gear and a second input gear, the brake part comprises a first brake and a second brake which are connected with a first input and a second input shaft, and brake application devices are arranged on the outer portions of the first brake and the second brake. According to the heavy vehicle gearbox with dual brakes, actions of the brakeapplication devices of the first brake and the second brake are controlled, different gears are selected, and therefore the aims of neutral positions, outputting of reverse gears different kinds of torque and speeds or outputting forward gears of different torque and speeds can be achieved, the lager torque and output power can be provided on the premise of reducing cost, and the gearbox has thebeneficial effects of bein