To provide an auxiliary apparatus for separately collecting garbage, efficiently separating and collecting kitchen garbage and household garbage.

The auxiliary apparatus for separately collecting garbage comprises: a crushing device crushing the garbage together with drainage water; a U-tube preventing counter flow of afoul smell; a drainage guide pipe guiding the drainage water from the U-tube to the downstream; a dedicated garbage bag in which the drainage water containing crushed garbage from the drainage guide pipe flows; an inner container in which the dedicated garbage bag is put; an inner container board on which the inner container is placed; a drainage storage tank temporally storing the drainage water; an elevating device vertically moving the drainage storage tank; an outer drainage pipe discharging the drainage water from the drainage storage tank to the outside; a return pipe returning water or air from the drainage storage tank to the drainage guide pipe; a bypass pipe guiding the water or air from the drainage guide pipe to the outer drainage pipe; a vacuum mechanism sucking the water or air from the drainage storage tank through the return pipe; a main shaft supporting the inner container board; an upper female pipe fixing the garbage bag; upper female pipe supporting beam supporting the upper female pipe; and a full sensor mechanism sensing a full state of the garbage bag.