The invention discloses a method for measuring the temperature of a hearth of an annealing furnace, and belongs to the technical field of rolling technologies. The method comprises the steps that datainformation in a control area is collected, wherein the data information comprises first data T1 of a first thermocouple, second data T2 of a second thermocouple, third data T3 of a third thermocouple and fourth data T4 of a fourth thermocouple; a first average value T is calculated according to a first coefficient n (i=1,2,3,4) of each thermocouple; a second coefficient m (i=1,2,3,4) of each thermocouple is obtained according to the first average value T; whether the first data T1, the second data T2, the third data T3 and the fourth data T4 meet first preset conditions or not is judged sequentially; and a second average value T is obtained according to judgment results and the second coefficient m. The technical effects that the accuracy of a thermocouple temperature data source and the uniformity of the furnace temperature of the annealing furnace are ensured, and accurate temperature control is conducted on strip steel are achieved.