The invention discloses a disconnecting switch with an anti-interference function. The disconnecting switch comprises a disconnecting switch body installed on a protective box, the inner walls of thetwo sides of the protective box are fixedly provided with one fixing plate, the bottom of the disconnecting switch body makes contact with the top of the fixing plate, two movable plates are installedon the fixing plate in a sliding mode, the disconnecting switch body is located between the two movable plates, the close sides of the two movable plates are each provided with a clamping plate, thedisconnecting switch body is located between the two clamping plates, the disconnecting switch body is matched with the two clamping plates, rotating plates are rotationally installed on the two innerwalls of the two sides of the protective box respectively, and the two movable plates are located between the two rotating plates. The disconnecting switch has the anti-interference function, the disconnecting switch body is convenient to install and fix, the height of the clamping plates is convenient to adjust, the disconnecting switch bodies of different sizes can be installed and fixed, and the disconnecting switch is simple in structure and convenient to use.