The utility model discloses a mixer. The garbage can comprises rack supporting legs and a can body, wherein the barrel body is mounted at the upper ends of support legs of the rack; the number of therack supporting legs is four. A discharging pipe is arranged on the outer wall of the front end of the lower side of the barrel body; the periphery of the outer part of the rear end of the dischargingpipe is sleeved with a transverse plate; a mixing baffle is arranged on the outer wall of the top end of the transverse plate; the bottom end of the material mixing baffle plate is inserted into thedischarging pipe; a speed reducer is connected to the center of the bottom of the barrel body; the lower end of the reducer is connected with a motor; a diffusion device for diffusing a contact surface of a to-be-mixed material is additionally arranged on the internal shaft rod; an extension rod is mounted on the shaft rod; the ring rod sleeve is installed on the outer wall of the circumference ofthe upper end of the extension rod, the diffusion rods are installed on the two sides of the ring rod sleeve respectively, when the shaft rod rotates to work, the extension rod is driven to be connected with the diffusion rods, the defects that needed mixed materials are bonded together all the time and cannot be well and evenly fused can be overcome, the needed mixed materials are evenly mixed,and the needed result is achieved.