Electrical suction device is a novel style mobile suction unit, which shell is made of plastic. It is fit for suctioning pus, blood, sputum and other thick liquid in human, body, It adopts imported film type vacuum pump, avoiding the pollution of oil mist. The pump requires no daily maintenance and serviding. The overflow protecion device in the maching may prevent liquid from flowing into the pump. Hand-Operated swith and footstep-swith and connected in parallel for option. The complete machine works stably and products a low level of noise and has a great flux. It can be easily operated and is durable