The invention discloses a power transmission system and a vehicle with the same. The power transmission system comprises a power source which is arranged to be used for driving a first pair of wheels, a driving motor which is arranged to be used for driving a second pair of wheels, and centrifugal clutches, wherein each centrifugal clutch comprises an inner ring, an outer ring, a locking structure and an elastic structure; a motor shaft of the driving motor is connected with the inner ring, and the outer ring and the second pair of wheels drive in a cooperative manner; the elastic structure is arranged in the outer ring and is used for elastically pushing and supporting the locking structure; one part of the locking structure is positioned in the inner ring, and the other part is positioned in the outer ring; when the rotating speed of the outer ring exceeds a separated threshold, the locking structure moves facing the outer ring, and the locking structure is wholly contained in the outer ring, so that the inner ring and the outer ring are in a separated state. The centrifugal clutches are arranged, so that the power transmission system disclosed by the invention has the advantages of simple structure, convenient control, low cost and the like.