The invention discloses a coating repainting and deformation repairing control method for a side-by-side machine case. The coating repainting and deformation repairing control method comprises the following steps: carrying out trial processing: carrying out trial spraying to form a coating on the side-by-side machine case which needs to be repainted and repaired; carrying out the trial processingon the side-by-side machine case according to the deformation amount of the side-by-side machine case subjected to the trial spraying of the coating, so as to obtain a thickness m of the needed sprayed coating, the number of times of turning corresponding to the deformation amount caused by the thickness m, and turning allowance when the side-by-side machine case is formally repainted and repaired; carrying out formal processing: carrying out formal spraying on the side-by-side machine case which needs to be repainted and repaired according to the thickness m of the needed sprayed coating obtained in a trial processing process; and carrying out formal turning processing on the side-by-side machine case subjected to the formal spraying according to the number of times of turning corresponding to the deformation amount and the turning allowance, which are obtained in the trial processing process. According to the method disclosed by the invention, the formally-processed side-by-side machine case can recover other non-processing precision dimensional accuracy.