The invention discloses a double-busbar current mutual induction sampling controller. A first busbar section, a second busbar section and a middle buscouple are each connected with three current sensors and three current transformers in series, two operational network circuits are connected behind every three current transformers, an analog switch is arranged on each output voltage signal path, switches control the states of the analog switches through encoders, and two current-type power amplifiers are connected to the positions behind each output voltage signal path. According to the double-busbar current mutual induction sampling controller, current transformer signals of the current transformers and buscouple switches which are arranged on the two busbar sections are automatically transformed into actual operating currents of the busbar sections according to the states of the switches arranged on the busbar sections; no matter the busbar sections are installed on the system side or the load side, the signals can be transformed into the equivalent operating currents of the system side or the load side, and therefore reactive and harmonic compensation devices independently work and are not affected.