The invention discloses a temperature fluctuation control method during continuous annealing of connected different strip steel. The method comprises the following steps that the nth coil strip steeland the (n+1)th coil strip steel are connected with each other in different strip steel, and continuous annealing is carried out; the adjustment scheme of the temperature and the process speed are determined according to the target temperatures of the steel types, the specifications and the soaking sections of the two coils of strip steel. According to the method, the process is optimized during connection production of different strip steel, when strip steel with different specifications and/or different steel types are continuous produced, the change of the actual value of the temperature ofthe soaking section is controlled within the range of +/-5 DEG C of the temperature target value of the soaking section, the stability of the performance of the annealed strip steel is facilitated, the length of the transition strip steel is reduced, and the product yield is improved.