Abstract: A portable knock down pigeon cage for easy transportation of homing pigeons is made up a top roof, a bottom base, a pair of foldable fences and a pair of lateral side walls. The foldable fences are pivotally engaged with the top roof and the lateral side walls are pivotally engaged with the bottom base and can be releasably engaged with the top roof so that the cage can be easily expanded when the top roof is pulled upwardly and the side walls are erected to engage with the top roof, and the cage can be easily knocked down by simply pushing down the lateral side walls. The cage is provided with a drawable waste collecting board in the bottom base so as to make the cleaning of the cage with ease.