The utility model relates to a rocker arm of a shock-resistant coal mining machine, which can improve the working condition of a planetary reduction gear effectively, and reduce the shock load on the planetary reduction gear. The rocker arm of the shock-resistant coal mining machine comprises a motor, a primary reducing mechanism, a secondary planetary reducer, a tertiary reducing mechanism, a roller, blades and cutting teeth, wherein the primary reducing mechanism is connected with the motor; the blades and the cutting teeth are arranged on the roller; the tertiary reducing mechanism is arranged at the output end of the rocker arm and connected with the roller; and the secondary planetary reducer is arranged between the primary reducing mechanism and the tertiary reducing mechanism. The rocker arm is simple and reasonable in structure, avoids the failure effectively, and improves the working efficiency of the coal mining machine.