The invention discloses a wheeled obstacle-crossing deformation chassis and a working method thereof. The wheeled deformation chassis comprises a chassis, a carrier table arranged at the upper end ofthe chassis, and a front driving module and a rear driving module arranged at the lower end of the chassis for driving the chassis. The carrier platform and the base are connected with each other by abalancing mechanism which keeps the carrier platform in a horizontal state; The front driving module comprises a fixed axle frame fixed on the front part of the base and perpendicular to the axial direction thereof, a force arm beam hinged on both ends of the fixed axle frame and axially rotatable about the fixed axle frame, and a plurality of driving wheels arranged on the force arm beam; the front driving module comprises a fixed axle frame fixed on the front part of the base and perpendicular to the axial direction thereof; The rear drive module comprises a fixing plate vertically fixed tothe rear of the base, a rear axle frame hinged to the fixing plate and rotatable axially about the base, and drive wheels arranged at both ends of the axle frame. The rear axle frame comprises a fixing plate vertically fixed to the rear of the base, a rear axle frame hinged to the fixing plate and rotatable axially about the base, and a driving wheel arranged at both ends of the axle frame. The invention realizes the balance of obstacle crossing better.