The invention discloses an air-inducing jet device which comprises a shell, an air inlet pipe, an air blower, a flow expanding cavity, an upper flow guiding circular pipe, a flow guiding cavity and a lower flow guiding circular pipe. The air inlet pipe is welded to the shell, and the other end of the air inlet pipe is fixedly connected to an air outlet of the air blower; the flow expanding cavity is welded to the upper portion of the interior of the shell, and the upper flow guiding circular pipe is vertically welded to the lower end of the flow expanding cavity; the flow guiding cavity is welded to the lower portion of the interior of the shell, and the lower flow guiding circular pipe is welded to the upper end of the flow guiding cavity; the upper end of the lower flow guiding circular pipe is inserted into the upper flow guiding circular pipe, and a gap is reserved between the outer wall of the lower flow guiding circular pipe and the inner wall of the upper flow guiding circular pipe. The air-inducing jet device has the advantages of being convenient to use, good in environment protection effect and the like.