The present invention relates to a method and apparatus for vertically mixing gas, liquid, powder and/or paste product, which comprises a hollow shaft and an internal shaft which are mounted in a shell, on the hollow shaft a paddle-shape mixing tool is mounted, and on the internal shaft an output device is mounted and placed under the outlet of mixing machine. When the mixing machine is being in working state, it is filled up completely, and the product and additive can be pressed on the internal wall of the shell body by means of mixing tool, and said product can be continuously flowed dowward under the action of gravity, and can produce retroaction to the paddle, and said continuous product flow can be regulated by means of rotating sliding valve mounted on the outlet.