The invention discloses a multifunctional wood grinder comprising a grinding chamber. The right side of the grinding chamber is provided with a feeding port, and the feeding port is fixedly connectedwith the interior of the grinding chamber; the lower end of the grinding chamber is provided with a bottom bracket, and the bottom bracket is fixedly connected with the interior of the grinding chamber; and the left side of the grinding chamber is provided with a motor fixed in the bottom bracket, and the front end of the motor is provided with a rotating shaft protecting shell fixedly connected with the interior of the motor. The multifunctional wood grinder is provided with a blower fixedly connected with the interior of the bottom bracket; an air source is delivered through the blower ideally pneumatically, and the blower is provided with a rotor which is rotated at high speed; air is driven by blades on the rotor to move at high speed, and the air is enabled to flow to an outlet of theblower along an involute under the effect of centrifugal force in an involute-shaped casing; high speed air flow has certain air pressure, and fresh air enters from the center of the casing for supplement, so that properly crushed sawdust is sucked into a connecting pipeline through the air pressure, and enters a discharging port; and the multifunctional wood grinder is very convenient.