REAR SUSPENSION SYSTEM OF AN ALL-TERRAIN VEHICLE AND ALL-TERRAIN VEHICLE

This disclosure discloses a rear suspension system of an all-terrain vehicle and an all-terrain vehicle. The rear suspension system includes a left rear suspension assembly and a right rear suspension assembly, which include: an axle support; a main control arm, having a first outer end, a first inner end, and a second inner end; a front upper control arm, having a second outer end and a third inner end; and a rear upper control arm, having a third outer end and a fourth inner end, where a connection line between the first and second inner ends is L a center axis of the first outer end is L a connection line between the third and fourth inner ends is L a connection line between the second and third outer ends is L and L L L and L are parallel to each other.