The invention discloses a multistage crushing stirring device used for forage production. The multistage crushing stirring device used for forage production comprises a bottom plate, a pre-crushing device, a material throwing device, a third motor, a second rotating shaft, a stirring rod, a crankshaft, a pitman shaft neck, a sleeve, a first connecting rod, a second connecting rod, and a crushing plate; the pre-crushing device comprises a feed hopper, a first motor, a first rotating shaft, and a crushing blade; the material throwing device comprises a second motor, an installation shaft, and afan plate. The multistage crushing stirring device is provided with the pre-crushing device, so that pre-crushing of forage raw materials is realized, and it is convenient for subsequent processing; the multistage crushing stirring device is provided with the material throwing device, so that forage can be thrown into an internal cavity of a stirring tank at the same time, collisional mixing of the forage is realized, and mixing efficiency is increased; the multistage crushing stirring device is provided with the third motor, the second rotating shaft, the crankshaft, the sleeve, the pitman shaft neck, and the crushing plate, the crushing plate is driven to move to the left and the right, forage secondary crushing smashing is realized, crushing stirring efficiency is improved, and forage mixing is more uniform.