The invention relates to a dc motor direct-current motor experiment field, and specially discloses a direct current motor heat run test apparatus, which includes a pulse stream voltage generating unit and a direct current motor to be tested, wherein, the output end of the pulse stream voltage generating unit is connected to the excitation winding of the direct current motor to be tested, and the pulse stream voltage generating unit provides a pulse stream voltage overlapped by an adjustable direct voltage component and an adjustable sine alternating current voltage component. In the experiment process, the direct current motor heat run test apparatus provided by the invention does not require standard matched test accompanying motor, and can more quickly realize the heat run test of the direct current motor.