The invention discloses a commutating pole structure of a large direct current motor. The commutating pole structure comprises a commutating pole coil, a commutating pole iron core, a coil support, laminated foil, cushion blocks, a screw and an insulating plate. The portions between turns of the coil are stuffed up by the cushion blocks, the commutating pole coil is fixed by the coil support, the commutating pole coil and the coil support are separated by the cushion blocks and lapped by the laminated foil, the coil support is fixed to the commutating pole iron core through the screw, and the coil support and the commutating pole iron core are separated by the insulating plate. The commutating pole structure can solve the problems that an existing commutating pole structure of the large direct current motor is difficult to machine and complex and is more compact and more reliable in design, and the insulating property and the mechanical strength of a commutating pole are improved.