Concentration difference jet flow air purifier for tunnel construction

A concentration difference jet flow air purifier for tunnel construction comprises a machine box, a dust filter, a ventilator and a jet flow nozzle, wherein the dust filter, the ventilator and the jet flow nozzle are arranged in the machine box. An air inlet of the dust filter is communicated with the outside of the case, an air outlet of the dust filter is connected with an air suction inlet of the ventilator, an air outlet of the ventilator is connected with an air inlet of the jet flow nozzle, and an air outlet of the jet flow nozzle faces the outside of the case. According to the concentration difference jet flow air purifier for tunnel construction, in the air purification circulation process, all air in a construction operation area is in organized flow under the action of jet flow air movement, no zero-pressure dull area exists, along with the increase of the circulation frequency, dust-containing air in a jet flow coverage area is continuously diluted under the action of air concentration difference,