Direct current motor without reversing device

The invention is to provide a DC (direct current) motor without a reversing device. The DC motor comprises a housing, an armature portion, an excitation portion and a rotating shaft. The armature portion and the excitation portion are combined into a working portion and then the working portion is arranged in the housing. The rotating shaft penetrates through the housing and the working portion. The inner layer of the working portion is connected with the rotating shaft to form a one piece and follows the rotating shaft to rotate. The armature portion comprises a squirrel-cage bar conductor and collector end rings, wherein the squirrel-cage bar conductor is inserted into the left and right collector end rings. A current input pathway and current output pathway are arranged in the housing. The housing is externally provided with a connection terminal. The current input pathway and the current output pathway are connected with the connection terminal. In the DC motor, the reversing device is saved and even a br