The invention discloses a novel coal mining machine and a grip arm thereof. The novel coal mining machine is characterized by comprising a grip arm, a machine body, a roller, a motor, a planetary speed reduction part, a gear speed reduction part, a grip arm housing, an output shaft, an input end and a connector, wherein one end of the grip arm is connected with the machine body, and the other end of the grip arm is connected with the roller; the motor, the planetary speed reduction part and the gear speed reduction part are arranged inside the grip arm; the motor is longitudinally distributed in the grip arm. The gear speed reduction part comprises a first gear and a second gear. According to the novel coal mining machine and the grip arm thereof, disclosed by the invention, a coal passing space is increased, a coal loading effect is improved; moreover, the blade length of the roller can be conveniently increased and the shovel spacing can be conveniently reduced according to needs, the roller can be conveniently arranged according to the needs, and therefore, the integral matching of the coal mining machine and a conveyor is improved.