The invention discloses a method and device for measuring the cell use time, relates to the cell management technology field and aims to realize accurate measurement of the cell use time of electronicwearable equipment and improve measurement accuracy of the cell use time. The method comprises steps that the cell capacity of a built-in cell of to-be-measured equipment is acquired; the real-time current of the to-be-measured equipment under preset conditions after removing the built-in cell is detected; the average current of the to-be-measured equipment in the preset time period after removing the built-in cell is acquired through statistics according to the real-time current; the cell use time is calculated according to the cell capacity and the average current. The method is advantagedin that the method is suitable for measuring the cell use time.