The invention relates to the technical field of cleaning equipment, in particular to a blowing and sucking integrated dust suction device which comprises an
airflow circulation part and a dust separation execution part, the
airflow circulation part comprises at least two stages of venturi tubes which are sequentially connected in series and communicated, and the venturi tubes are covered with collecting covers; a collecting cavity is formed in the collecting cover, a collecting opening and a
backflow opening which are communicated with the collecting cavity are formed in the collecting cover, a
backflow pipeline is connected between the
backflow opening and the Venturi tube located above the backflow opening, negative pressure is formed around after
airflow is sprayed out from the spraying opening at a high speed, and negative pressure suction carries dust-containing gas to enter the collecting cavity from the collecting opening. Then the air flow sequentially passes through the backflow opening and the backflow
pipe to re-enter the acceleration channel; a traditional'single-stage acceleration-separation 'open-loop mode is broken through, a'
kinetic energy recovery-secondary acceleration-enhanced separation' closed-loop
system is constructed through countercurrent
coupling of the Venturi tube and the
cyclone separator, the closed-loop
system completely isolates dusty gas from leaking out, and dual improvement of the energy
utilization rate and the dust removal efficiency is achieved.