The utility model discloses a laboratory rat cage. The laboratory rat cage comprises a cage body, a cage cover and a stop portion arranged between the cage body and the cage cover. The stop portion comprises two partitions including an upper partition and a lower partition, the upper partition comprises a support, a plurality of partition pieces are arranged on the support detachably, a filter piece is arranged between each partition piece and the lower partition, and each partition piece is fastened and clamped with the support. The partition pieces are convenient to detach so as to replace and clean the filter pieces, and material waste of the filter pieces is reduced.