The utility model relates to a part of a crawler tractor, in particular to a supporting carriage with an sealed end face, which mainly solves the technical problems that in the prior art, abrasion of parts such as supporting wheel axles and the like is accelerated as muddy water, sand and dust can enter a supporting carriage from gaps of the end faces of supporting wheels, accordingly the service life of the supporting carriage is shorter, and the like. The supporting carriage with an sealed end face comprises an inner balance arm and an outer balance arm which are connected together by a swing shaft, a buffer spring is mounted between the inner balance arm and the outer balance arm, a carriage shaft is arranged beside the swing shaft, both the inner balance arm and the outer balance arm are connected with supporting wheels by the aid of supporting wheel axles, one end of the carriage shaft is provided with a carriage shaft supporting end cap, the other end of the carriage shaft is provided with a carriage shaft blank cap, a carriage shaft locking bolt is further fixed to the end with the blank cap on the carriage shaft, and an oil cup is arranged on the carriage shaft locking bolt and communicated with a gap between the carriage shaft and the outer balance arm by the aid of an oil way.