The invention relates to technical field of industrial sand making equipment, and particularly provides a vertical milling sand making machine characterized in that a transmission apparatus includes amotor, a coupling and a speed reducer. The output shaft of the motor is connected with a horizontal input shaft hole in the speed reducer through the coupling. A rotary disc is coupled to a verticaloutput shaft of the speed reducer. A milling apparatus includes a mill roller, a rotary arm and a mill disc. The mill disc of the milling apparatus is fixed by the rotary disc. A pressurizing device is fixed to ground, wherein the working end of the device is rotatably connected to the mill roller in the milling apparatus. A position limiting device is arranged on periphery of the transmission apparatus, wherein an inclined arm of the position limiting device is in bolt connection with the rotary arm of the milling apparatus. Compared with the prior art, the sand making machine is high in milling efficiency, is low in electricity consumption, is high in sand yield, is large in granularity of feeding raw materials, can form round and smooth sand grains, is simple in process and small in occupied area, is low in noise and dust raising, is easy to use and maintain, is low in operation cost and is low in consumption of wear-resisting materials.