The invention discloses a control system of an automatic vending machine and a method thereof. The control system of the automatic vending machine comprises a controller, a compressor, a condenser, a drying filter, a throttling element, an evaporator, a temperature sensor, a coin identification device, a card reader, a note recognition unit, a currency accumulator, a first microprocessor, a picking button, a change device, a vertical lifting motor, a vertical lifting pulley, a horizontal motor, a horizontal pulley, a hydraulic motor, a hydraulic pump, a mechanical hand reversing valve, a mechanical hand hydraulic cylinder, a mechanical hand, storage shelves, cargo trays, a resistance type weighing sensor, an electronic amplifier, an A/D converter, a second microprocessor, a pick-up door opening and closing motor, pick-up door chain wheels, a pick-up door, an electric relay, a coin hopper, a coin slot, a control keyboard, a memory, a display screen, a change opening, an indicator light, a coin reject slot, and an exciter lamp. Concerning the phenomenon that sometimes no goods come out of the automatic vending machine with goods when coins are put in, nor the coins are returned, the control system of the automatic vending machine and the method thereof carry out improvements and perfections of the control system.