Intermediate annealing method of aluminum coil

The invention discloses an intermediate annealing method for an aluminum coil. The intermediate annealing method comprises the steps that S1, base oil is evenly sprayed to the end faces of the two ends of the aluminum coil; s2, the aluminum coil sprayed with the base oil is put into an annealing furnace, and then the annealing furnace is washed with nitrogen; s3, the annealing furnace subjected to furnace washing is subjected to heating treatment; and S4, after heating treatment is finished, side cooling is started in the annealing furnace, and after the temperature of the aluminum coil is smaller than 150 DEG C, the aluminum coil is taken out of the annealing furnace, so that intermediate annealing of the aluminum coil is completed. According to the intermediate annealing method for the aluminum coil, the phenomenon that the edge of the rolled aluminum coil is white is reduced, modification or cutting of the aluminum coil is correspondingly avoided, and in addition, the intermediate annealing method for the