The utility model discloses a coal cutter rocker arm applicable to a thin coal seam mining. The coal cutter rocker arm for applicable to the thin coal seam mining comprises a shell body, a planetary mechanism, and a roller, wherein the shell body is connected with the roller through the planetary mechanism. The planetary mechanism comprises a sun wheel, a planetary wheel, an inner gear ring, a bearing seat, a nut and a screw, wherein the planetary wheel is arranged between the sun wheel and the inner gear ring, the nut is a flat nut or a thin nut, the shell body is provided with a shell body nest which is directly processed into a T-shaped groove, the nut is arranged in the shell body nest, the shell body, the inner gear ring, the bearing seat are connected in a fastened mode through the screw and the nut. The coal cutter rocker arm applicable to the thin coal seam mining is characterized in that the shell body nest of the installing nut is the T-shaped groove which is directly formed by processing, and meanwhile the flat nut is used for connecting, an axial connection dimension is shortened by 20-40mm, so that the thickness of the planetary mechanism is reduced, and the structural design problem of thin coal seam high-power coal cutter rocker arm is solved.