The invention relates to a control method for five-rack tandem cold rolling mill rack shortage rolling. The control method is characterized in that a treatment method comprises the first step of pre-setting control, the second step of tension control, the third step of automatic thickness control, the fourth step of automatic thickness control micro tracking, the fifth step of automatic thickness control quantity treatment and the sixth step of main control welding line tracking; and according to the technical scheme, the rest of four racks can finish the rolling function when one of racks breaks down, and the quality close to the quality of products subjected to ordinary rolling of five racks can be provided.