Outdoor isolating switch and use method thereof

The invention discloses an outdoor isolating switch and a using method thereof, and belongs to the technical field of isolating switches. The supporting plate is fixedly connected between the left inner wall and the right inner wall of the protection box, and a first mounting groove is formed in the upper end of the supporting plate. After dust enters the protection box, the dust can be effectively prevented from entering the protection box through the dustproof net plate, but the dustproof net plate can be blocked by the dust after being used for a long time; the problem of slow heat dissipation of the isolation switch main body caused by rainwater permeation into the protection box is solved, slow heat dissipation also affects use of the isolation switch main body, and the dustproof net plate is rapidly replaced in a clamping manner, so that the problem of poor heat dissipation caused by excessive accumulation of dust in the dustproof net plate is solved; and the rainwater can be discharged outwards through