The invention discloses a wheel forming closed die cavity drainage device, and belongs to the field of integral rolled steel train wheel hot forming process. The wheel forming closed die cavity drainage device comprises an upper die base and a lower die base, wherein an upper forming die is fixedly arranged below the upper die base, and a lower forming die is fixedly arranged above the lower die base; the upper forming die and the lower forming die are oppositely matched for use, and a cavity formed between the upper forming die and the lower forming die is used for forming a forming blank; alower die cavity drainage device is arranged on the lower die table, annular water outlets are formed in the lower die cavity drainage device correspondingly, and drainage groove openings are formed below the annular water outlets, so that the timeliness of water outlet is ensured. The lower die cavity drainage device is applied to the reverse spoke rim plate spacing large difference wheel deformation, and facilitates the filling of the outer side face rim and the inner side face rim of the forming blank; and a die device is practical and reliable, the qualification rate of the product is greatly improved, and the batch production of a wheel is realized.