Casting system of planet carrier casting of mining machinery

The invention provides a casting system of planet carrier castings of mining machinery. The technical scheme of the casting system is that the casting system structurally comprises a sand box, an internal sprue, a transverse runner, a straight runner, an external sprue, an air outlet, a plurality of feeder heads and a mold cavity. The casting system is characterized in that the transverse runner is arranged at the lower part of the sand box; the internal sprue is communicated with the bottom of the mold cavity; an inoculation runner is further arranged between the transverse runner and the straight runner; a transit transverse runner is arranged at the middle section of the straight runner; and the plurality of feeder heads are all arranged above the mold cavity and are distributed uniformly.