The invention discloses a wagon bogie and a sleeper beam thereof. The sleeper beam comprises a beam body. The two ends of the beam body are provided with protruding portions respectively, wherein the protruding portions are symmetrical about a transverse center line. The protruding portions are provided with installation holes connected with a wagon body and anti-snaking damper bases are arranged on the two protruding portions located on one side of the transverse center line. The two ends of the beam body are further provided with secondary spring bases symmetrical about a lengthwise center line. Wing plates symmetrical about the transverse center line are arranged in the middle of the beam body and installation holes for installing traction pins are formed in the wing plates. The sleeper beam structure can be connected with a traction system of the bogie, anti-snaking dampers of the bogie and secondary springs of the bogie, connection between the sleeper beam and the wagon body is easy to realize, therefore, through the sleeper beam structure, connecting points between the bogie and the wagon body can be reduced and the assembling difficulty and the splitting difficulty between the bogie and the wagon body can be greatly reduced.