The invention discloses a multifunctional automatic breaking feed pulverizer. A first motor is arranged in an automatic breaking bin. A rotating shaft of the first motor is connected with a breaking cutting tool. A pulverizing bin is formed below the automatic breaking bin. The automatic breaking bin is connected with the pulverizing bin through a feed port of the pulverizing bin. A filtering screen is arranged on one side of the feed port of the pulverizing bin. A dust suction bin is formed in one side of the filtering screen. A second motor is arranged in the dust suction bin. A rotating shaft of the second motor is connected with dust suction fan blades. A dust collecting tank is arranged on one side of the dust suction bin. A movable baffle is arranged on the other side of the feed port of the pulverizing bin. A feed plate is arranged below the movable baffle. A third motor is arranged in the pulverizing bin. A rotating shaft of the third motor is connected with a pulverizing cutting tool. According to the pulverizer, the structure is simple, design is reasonable, working efficiency is high, and dust is little. For large materials, breaking can be carried out first through an automatic breaking machine; and for small materials, the materials can be directly ground by the pulverizer.