The invention relates to an aluminium-clad steel strip and a preparation method thereof as well as a steel strip and an aluminium alloy strip used thereby, in particular to an aluminium-clad steel strip for coolers and a preparation method thereof as well as a steel strip and an aluminium alloy strip used thereby. The invention solves the problems of pinholes, composite layer inclusions, generation of brittle iron aluminium metallic compounds and failure to adapt to brazing technology in the industrially produced steel-aluminium composite material at present. The aluminium-clad steel strip for coolers is prepared by cladding a steel strip and an aluminium alloy strip. The preparation method comprises the following steps: 1. pretreating the surfaces of the steel strip and the aluminium alloy strip; 2. sandwich-rolling; and 3. recrystallization annealing. In the steel strip, the content of C is less than 0.01%, the content of Si is less than 0.01%, the content of Mn is 0.20-0.30%, and the content of Alt is less than 0.005%. In the aluminium alloy strip, the content of Si is 0.70-0.90%, and the content of Fe is 0.30-0.45%. The invention is applicable to the field of brazing coolers.