The utility model discloses a blizzard disaster detecting device for an electric transmission line. The blizzard disaster detecting device is characterized by comprising a hanging bracket and a test box, two extension springs are hanged in the test box, lower ends of the two extension springs stretch out from the box bottom of the test box and are connected to a first cross beam under the box bottom, a hanging ring is connected to under the first cross beam, a connecting rod is connected on the first cross beam, a length of slide piece is connected to the upper portion of the connecting rod, the slide piece can longitudinally move driven by the connecting rod, a first detecting member and a second detecting member are respectively disposed in the path where the slide piece longitudinally moves, and a signal processing circuit is disposed in the box body. The blizzard disaster detecting device for the electric transmission line is simple in structure and convenient to mount, the telescoping performance of the spring can be used for representing work conditions of the electric transmission line, the slide piece corresponding to the extension springs is disposed in the test box, the work conditions of the electric transmission line can be judged through detecting the position of the slide piece, so the blizzard disaster detecting device can effectively give early warning aiming at blizzard disaster.