The invention relates to a continuous variable vortex generation device for a diesel engine. The continuous variable vortex generation device comprises an air inlet pipe, inlet air pipes, a sealing strip, a blade connecting rod, a blade synchronizing mechanism, a synchronous cog belt, a driving gear, a driven gear, a driving cam, a driven cam, a cog belt and a supporting gear. The driving gear andthe driven cam are coaxial, a key groove is formed in the shaft to connect a servo motor to provide a torque to the whole mechanism. The driven gear and the driven cam are coaxial. Two supporting wheels are mounted on the air inlet pipe to support the synchronous cog belt to rotate, the guide vanes are obliquely embedded into a wall of the air inlet pipe in an equally spaced manner, and the direction of the cross section is kept consistent to the normal direction of a round wall of the air inlet pipe all the way; and the blade synchronizing mechanism can enable the guide vanes to come in andgo out in a reciprocating manner synchronously in the air inlet pipe. The continuous variable vortex generation device can improve mixing of air and a fuel in the cylinder better, improves the combustion efficiency, and achieves effects of saving energy and reducing emission of the diesel engine.