The invention discloses a system for controlling a transformer substation live washing robot and a method. The system includes a remote module, an on-board monitoring module and a platform information collection module; wireless equipment is adopted between the remote module and the on-board monitoring module and also between the on-board monitoring module and the platform information collection module in constituting a WIFI network to realize data interaction among the three modules. The system and the method can effectively reduce tedious physical labor of workmen in cleaning, guarantee safety of the workmen, and at the same time prevent pollution flashover incidents to equipment and guarantee safe running of the grid through cleaning the pollution of the equipment.