Rocker arm of coal mining machine and super-large mining height coal mining machine

The utility model discloses a rocker arm of a coal mining machine and the coal mining machine with the ultra-large mining height. The rocker arm comprises a shell, a driving motor, an idle wheel set,a central gear, a planetary gear train and a roller mounting plate, wherein the shell comprises a machine body connecting part, an idle wheel mounting part and a planetary gear train mounting part which are connected in sequence; the driving motor is mounted in the machine body connecting part, the idle wheel set is mounted in the idle wheel mounting part, and the planetary gear train is mounted in the planetary gear train mounting part; a motor gear is arranged at the output end of the driving motor, and an input end gear of the idle wheel set is meshed with the motor gear; the central gear is mounted in the planetary gear train mounting part through a central gear shaft, and an output end gear of the idle gear set is meshed with the central gear; a central gear in the planetary gear train is mounted on the centr