The utility model relates to a little valve gear based on magnetism drives liquid accuse switching -over belongs to precision measuring equipment technical field. The utility model discloses a power I, solenoid I, valve body, magnetic liquid drip, solenoid II, power II, the valve body is equipped with export I, export II, import, and directly over magnetic liquid dripped and to be located the import, solenoid I was located the valve body right side, and solenoid II is located the valve body left side, solenoid I, solenoid II be close to export II respectively and export I, solenoid I, solenoid II is connected with power I, power II respectively. The utility model discloses simple structure, it is easy and simple to handle, resources are saved, reduce cost. Through the regulation of power, whether control solenoid produces magnetic field to the removal that control magnetic liquid drips is with the switching of realizing the gas outlet. Device technology is succinct, simple operation, model simplification, easy understanding.