Preparation method of ultrathin precise stainless steel band

The invention discloses a preparation method of an ultrathin precise stainless steel band. The preparation method comprises the following processes: (1) primary rolling: continuously rolling a steel band for 9-12 passes; (2) primary annealing: annealing at the temperature of 800-880 DEG C; (3) secondary rolling: continuously rolling for 4-6 passes; (4) secondary annealing is conducted, specifically, annealing is conducted at the temperature of 1050-1120 DEG C; (5) withdrawal and straightening treatment is conducted, specifically, straightening is conducted with the elongation of 0.3-0.7% and the tension of 700-800 N/mm; and (6) heat treatment: annealing at the temperature of 500-550 DEG C to obtain a heat-treated steel strip. The ultrathin steel strip is obtained through multiple times of continuous rolling, annealing and heat treatment processes, the plate face is straight, and the mechanical performance and the appearance are improved; a spinel coating is arranged on the surface of the steel strip through s