Disclosed are a quantity regulating module of an automatic tablet dispenser, and a tablet dispensing method thereof, which are capable of automatically packing various-shaped tablets, and accurately, rapidly and cleanly controlling supplying of tablets without missing any. The quantity regulating module includes: a module body including an inlet through which a tablet is put, a hopper-side supply part supplying the tablet put through the inlet to a hopper of a medicine packing machine, and a recollecting part returning the tablet put through the inlet to a location from which the tablet starts to be transferred; a detecting sensor counting the number of tablets put through the inlet; and a controller comparing the number of tablets counted by the detecting sensor to a predetermined quantity, transferring the tablets to the hopper-side supply part if the counted number of tablets is equal to the predetermined quantity, and transferring the tablets to the recollecting part if the counted number of tablets exceeds the predetermined quantity.