The invention relates to a control method of an automatic ice maker system of a refrigerator. The control method comprises the following steps of S1, detecting whether an ice storage box is full of ice, if so, causing a water inlet module to stop water supply and an ice maker to stop working, if not, entering S2; S2, injecting water to an ice cube tray through the water inlet module; S3, judging whether the ice cube tray has water, if so, causing a processor to control the ice maker to make ice and executing S4, if not, causing the processor to control the water inlet module to stop water supply and control the ice cube tray to turn at least once, and stopping the ice maker; S4, judging whether ice making is completed by the processor so as to control the ice cube tray to turn to discharge the ice, and returning to S1 after the ice is discharged. According to the method, the water is added into the ice maker timely or the ice making is stopped timely, idling of a motor and the ice maker is avoided, the working efficiency of the ice maker is improved, and meanwhile, the working condition of the ice maker is fed back timely so as to be more user-friendly.