The structure of a light-weight sewage suction device includes a control unit, a negative pressure unit, a number of hoses, and a sewage suction pipe. The upper part of the control unit and the negative pressure unit use a first soft It is connected to the pipe, and the second end of the negative pressure unit is connected to the sewage pipe by a second hose； it is mainly connected to the control unit and the negative pressure unit to set a space for water, and the control unit A through hole is appropriately arranged at the bottom, and a control element is arranged at the through hole to control the opening or closing of the through hole corresponding to the accommodation space. After the control unit and the negative pressure unit are respectively filled with water, the sewage suction pipe is placed in the water to be cleaned, and then the control element controls the through hole to be opened, and the sewage can be passed through the sewage suction pipe. The control unit is discharged to the outside, which is convenient to carry and operate the suction cleaner.一種輕便型吸污器之組成結構，包括一控制單元、負壓單元、若干軟管，以及一吸污管等構件，其中該控制單元上方與該負壓單元之間，係利用一第一軟管接設，而該負壓單元另端與該吸污管之間係利用一第二軟管接設；主要係於該控制單元及負壓單元內設置裝水的空間，並於該控制單元底部適當處設一通孔，該通孔處設一控制元件，用以控制該通孔對應該容置空間的開啟或關閉。當該控制單元及負壓單元內部分別裝入水後，將該吸污管置於欲清潔的水中，再令該控制元件控制該通孔呈開啟狀態，便可透過該吸污管將污水經由該控制單元向外排放，方便吸污器的攜帶及操作使用。
