The utility model relates to a looped network control system of a medium-voltage power grid, which is characterized in that the lopped network control system comprises four medium-voltage power distraction panels, each medium-voltage power distribution panel is supplied with power by two diesel generators, two ends of each medium-voltage power distribution panel are respectively connected with a bus coupler, two bus couplers on the two adjacent medium-voltage power distribution panels are connected in series, each medium-voltage power distribution panel is connected with two propellers and a transformer, and the two medium-voltage power distribution panels in the middle are respectively provided with a transformer used for variable-frequency driving for drilling. As a generation unit adopted by the looped network control system can supply power to one or two or three or four medium-voltage power distribution panels in the power grid optionally via the bus couplers and can switch mutually according to different working conditions, the looped network control system realizes high flexibility and can be widely applied to the field of petroleum exploration and development.