The present invention relates to an improved automatic slurry grinding machine, and belongs to food machinery. The improved automatic slurry grinding machine comprises a slurry storage tank 1, a lower grinding disc pillar 7, an upper grinding disc 13, a base 28 and the like, wherein the fastener coupling device 45 comprises an upper fastener 46 and a lower fastener 47, the lower fastener 47 comprises a lower fastener bracket 64, a lower fastener sleeve 65, a fastener nail 66, a sealing cover 68, a sealing ring 69, a reduction gearbox 9 and a motor 8, the water outlet gate device 38 comprises a water outlet gate screw 34, a water outlet gate hole 35, a water outlet gate rubber ring 36, an adjustment nut 37 and a water tank 44, the locking device 39 of the upper grinding disc 13 comprises a locking bolt 40, a central long shaft 41, a flat pad rubber ring 42 and an upper grinding disc inner hexagonal hole 43, and the stirring rod device 73 comprises a stirring rod horizontal handle 74 and a stirring rod long handle 75. According to the present invention, the upper grinding disc can be removed, such that human hands can directly insert into the slurry storage tank so as to clean; no slurry is remained on the bottom of the slurry storage tank; and the slurry is ensured, bottom pasting does not appear, and the beverage quality can be improved.