ORC-23BI portable electric suction unit is low in noise level. It meets the requirements for suctioning pus, sputum and other thick liquids in surgical operations and in household healthcare, and may also be used in suctioning of other purposes. The machine adopts oil-free lubricating pump, avoiding the pollution of oil mist. The pump requires no daily maintenance and servicing. The overflow protection device prevents liquid from flowing into the pump. Hand-operated switch and footstep-operated switch are connected in parallel for option. The machine is characterized with low noise level, small volume and high mobility.