The apparatus (1) collects and lifts the grain while moving in a direction against the bag (B) and cutting the bag (B) in an upper part thereof, the apparatus dividing the bag (B) in two side strips that are rolled up in rotary side spools (2a,2b), wherein once the strips are rolled up in the spools (2a,2b) the spools are removed from the apparatus (1) to collect the bag strips.