The utility model discloses a quick on -off switch of dual supply improves structure, characterized by, including first inlet wire row, the second inlet wire is arranged and the row of being qualified for the next round of competitions, characterized by, still including the magnetic control pendulum rod, the fulcrum, electromagnet assembly and permanent magnet subassembly, the row of being qualified for the next round of competitions is connected to the magnetic control pendulum rod, and the magnetic control pendulum rod sets up on the fulcrum, the utility model is characterized in that, electromagnet assembly and permanent magnet subassembly set up respectively by magnetic control pendulum rod position, the permanent magnet subassembly keeps magnetic control pendulum rod quiescent condition, control the swing of magnetic control pendulum rod after the electromagnet assembly circular telegram, make the first inlet wire of magnetic control pendulum rod contact arrange or contact second inlet wire row, first inlet wire is arranged or the row of being qualified for the next round of competitions connects second inlet wire row so that the row of being qualified for the next round of competitions connects, realize the switching conversion of dual supply.