The invention relates to a testing method for simulating pellet oxidation through a coke reactivity testing device. The testing method comprises the steps of arranging an air blower and an air blowing connecting system on the coke reactivity testing device; putting pellets into the coke reactivity testing device to be subjected to oxidation test for 90 min to 120 min at the oxidation temperature of 850 DEG C to 1250 DEG C; and after energization oxidation, continuing to blow air till the temperature in a high-temperature reaction tube drops to 1000 DEG C, so as to further oxidize the pellets. According to the testing method, the coke reactivity testing device is utilized to simulate the oxidation process of the pellets in equipment like a shaft furnace and a grating machine-rotary kiln under the laboratory conditions, a relationship among oxidation temperature, oxidation time, oxidation air volume, pellet oxidation degree and physical and chemical properties of the pellets is acquired, reliable parameters are provided for oxidation operation of the pellets, the pellets of different oxidation degrees can be directly subjected to reduction test, and a relationship between the oxidation degrees of the pellets and reduction characteristics is acquired.