Power system with torque amplifying mechanism, truck and steamship

The power system comprises a driving device used for providing power and a speed change mechanism used for power speed regulation, the torque amplification mechanism amplifies torque of the driving device and then outputs the torque to the speed change mechanism, and the torque amplification mechanism comprises a first conveying wheel, a second conveying wheel, a third conveying wheel and a fourth conveying wheel which are sequentially arranged in the power transmission direction. The first transmission wheel serves as a power input part of the torque amplifying mechanism, and the rotating shaft serves as a power output part of the torque amplifying mechanism; the rotating shaft and the wheel disc are coaxially connected and rotate synchronously, the first transmission wheel is connected with the output end of the driving device, the outer ring of the wheel disc is matched with the first transmission wheel through a first transmission structure, and the rotating shaft is connected with the input end of the sp