The utility model belongs to the technical field of an internal combustion engine, and relates to a Venturi tube device for realizing waste gas recirculation of a two-stage supercharging diesel engine, which overcomes the problem for realizing good waste gas recirculation of a single Venturi tube in a full-load operating condition of the engine. The Venturi tube device comprises an engine, an intercooler, a low-pressure-stage turbine, a low-pressure-stage gas compressor, a high-pressure-stage turbine, a high-pressure-stage gas compressor, an EGR cooler, a large Venturi tube, a small Venturi tube, an engine exhaust manifold tube, an engine intake manifold tube and an electric EGR valve; the engine exhaust manifold tube is connected with the high-pressure-stage turbine, and the high-pressure-stage turbine is connected with the low-pressure-stage turbine; the low-pressure-stage gas compressor is connected with the high-pressure-stage gas compressor; the engine exhaust manifold tube is connected with the EGR cooler, the EGR cooler is connected with the electric control EGR valve and then is branched by virtue of a tee pipeline, two branch pipelines are respectively connected with the small Venturi tube and the large Venturi tube. By adopting the Venturi tube device, feasibility for providing a large-ratio EGR for the engine can be realized, and the NOx emission in a cylinder can be reduced.