A desulphurization control system comprises a UPS, an emergency power supply, a public power cabinet electrically connected with the UPS and the emergency power supply, a plurality of power cabinets electrically connected with the UPS and the emergency power supply, a plurality of desulphurization units electrically connected with the power cabinets one to one respectively, a dehydration system control cabinet, a slurrying system control cabinet, a waste water system control cabinet and a CPU cabinet, wherein the dehydration system control cabinet, the slurrying system control cabinet, the waste water system control cabinet and the CPU cabinet are respectively and electrically connected with the public power cabinet, the desulphurization units comprise a plurality of desulphurization unit control cabinets, and the number of the power cabinets is equal to that of the desulphurization unit control cabinets. According to the desulphurization control system, isolated power supply to the desulphurization units is achieved, loads on the power supplies are reasonably distributed, and reliability of the desulphurization control system is greatly improved.