A dead axle for a rail vehicle, comprising: an axle body, the axle body being configured to be connected to a vehicle frame of a rail vehicle; two running wheels separately mounted on two sides of the axle body, the two running wheels being rotatable in the axial direction of the running wheels and being mounted on the axle body such that the running wheels can swing to the left and to the right relative to a longitudinal direction, each running wheel being configured to be supported on a rail beam along which the rail vehicle travels; a guiding frame, the guiding frame being mounted on the axle body rotatably relative to the axle body in the horizontal direction via a support post assembly, the support post assembly comprising two auxiliary support posts, a first end of each auxiliary support post being mounted on the axle body; a main support post, a first end of the main support post being mounted on the axle body, a second end of the main support post being axially rotatably mounted on the guiding frame; and two guiding frame support wheels, the guiding frame being provided with a chute, a second end of each auxiliary support post passing through the chute to be connected to the guiding frame support wheel, the guiding frame being supported on the guiding frame support wheel; a horizontal wheel (230, 240), the horizontal wheel (230, 240) being disposed on the guiding frame; wherein the horizontal wheel (230, 240) comprises a front horizontal wheel and a rear horizontal wheel, and the front horizontal wheel and the rear horizontal wheel are disposed on the guiding frame at an interval in the longitudinal direction; and a connecting rod component, the connecting rod component comprising a first transverse pull rod and a second transverse pull rod, the first transverse pull rod being pivotally mounted on the guiding frame, the second transverse pull rod being directly or indirectly connected to the first transverse pull rod and the running wheels, wherein the dead axle is configured such that, when the rail vehicle turns left, the horizontal wheel (230, 240) cooperates with the rail beam to drive the guiding frame to swing and drive the first transverse pull rod to move together, and the second transverse pull rod is driven by the first transverse pull rod to drive the running wheels to swing to the left, and wherein the dead axle is configured such that, when the rail vehicle turns right, the horizontal wheel (230, 240) cooperates with the rail beam to drive the guiding frame to swing and drive the first transverse pull rod to move together, and the second transverse pull rod is driven by the first transverse pull rod to drive the running wheels to swing to the right. an axle body, the axle body being configured to be connected to a vehicle frame of a rail vehicle; two running wheels separately mounted on two sides of the axle body, the two running wheels being rotatable in the axial direction of the running wheels and being mounted on the axle body such that the running wheels can swing to the left and to the right relative to a longitudinal direction, each running wheel being configured to be supported on a rail beam along which the rail vehicle travels; a guiding frame, the guiding frame being mounted on the axle body rotatably relative to the axle body in the horizontal direction via a support post assembly, the support post assembly comprising two auxiliary support posts, a first end of each auxiliary support post being mounted on the axle body; a main support post, a first end of the main support post being mounted on the axle body, a second end of the main support post being axially rotatably mounted on the guiding frame; and two guiding frame support wheels, the guiding frame being provided with a chute, a second end of each auxiliary support post passing through the chute to be connected to the guiding frame support wheel, the guiding frame being supported on the guiding frame support wheel; a horizontal wheel (230, 240), the horizontal wheel (230, 240) being disposed on the guiding frame; wherein the horizontal wheel (230, 240) comprises a front horizontal wheel and a rear horizontal wheel, and the front horizontal wheel and the rear horizontal wheel are disposed on the guiding frame at an interval in the longitudinal direction; and a connecting rod component, the connecting rod component comprising a first transverse pull rod and a second transverse pull rod, the first transverse pull rod being pivotally mounted on the guiding frame, the second transverse pull rod being directly or indirectly connected to the first transverse pull rod and the running wheels, wherein the dead axle is configured such that, when the rail vehicle turns left, the horizontal wheel (230, 240) cooperates with the rail beam to drive the guiding frame to swing and drive the first transverse pull rod to move together, and the second transverse pull rod is driven by the first transverse pull rod to drive the running wheels to swing to the left, and wherein the dead axle is configured such that, when the rail vehicle turns right, the horizontal wheel (230, 240) cooperates with the rail beam to drive the guiding frame to swing and drive the first transverse pull rod to move together, and the second transverse pull rod is driven by the first transverse pull rod to drive the running wheels to swing to the right.