An overpressure protection switch, comprising: a switch body defining a communicating opening; a first switch terminal disposed in the switch body and having a first contact; a second switch terminal disposed in the switch body, a first end of the second switch terminal being a fixed end, a second end of the second switch terminal being a movable end and having a second contact, and the second contact being normally in contact with the first contact; the switch body is provided with a fixing seat therein, the fixing seat defines a guiding hole; an actuating device disposed between the second switch terminal and the communicating opening; the actuating device comprises: an actuating rod disposed in the guiding hole, a first end of the actuating rod being configured to extend out of the guiding hole to actuate the second switch terminal, and a second end of the actuating rod being connected to the sealing device; and a sealing device disposed at the communicating opening to isolate an interior of the switch body from the communicating opening, and the sealing device being connected to the actuating device; wherein when an environmental pressure applied by an external environment through the communicating opening reaches a predetermined pressure, the sealing device drives the actuating device to actuate the second switch terminal, such that the second contact moves from a contact position where the second contact is normally in contact with the first contact to a disconnected position where the second contact is separated from the first contact, characterized in that, the first switch terminal and the second switch terminal are fixed to the fixing seat; and a holding device is disposed in the switch body, and the holding device keeps the second contact in the disconnected position; and an elastic resetting member is disposed in the guiding hole, the elastic resetting member being configured to constantly push the actuating rod in a direction running away from the second switch terminal. a switch body defining a communicating opening; a first switch terminal disposed in the switch body and having a first contact; a second switch terminal disposed in the switch body, a first end of the second switch terminal being a fixed end, a second end of the second switch terminal being a movable end and having a second contact, and the second contact being normally in contact with the first contact; the switch body is provided with a fixing seat therein, the fixing seat defines a guiding hole; an actuating device disposed between the second switch terminal and the communicating opening; the actuating device comprises: an actuating rod disposed in the guiding hole, a first end of the actuating rod being configured to extend out of the guiding hole to actuate the second switch terminal, and a second end of the actuating rod being connected to the sealing device; and a sealing device disposed at the communicating opening to isolate an interior of the switch body from the communicating opening, and the sealing device being connected to the actuating device; an actuating rod disposed in the guiding hole, a first end of the actuating rod being configured to extend out of the guiding hole to actuate the second switch terminal, and a second end of the actuating rod being connected to the sealing device; and a sealing device disposed at the communicating opening to isolate an interior of the switch body from the communicating opening, and the sealing device being connected to the actuating device; wherein when an environmental pressure applied by an external environment through the communicating opening reaches a predetermined pressure, the sealing device drives the actuating device to actuate the second switch terminal, such that the second contact moves from a contact position where the second contact is normally in contact with the first contact to a disconnected position where the second contact is separated from the first contact, characterized in that, the first switch terminal and the second switch terminal are fixed to the fixing seat; and a holding device is disposed in the switch body, and the holding device keeps the second contact in the disconnected position; and an elastic resetting member is disposed in the guiding hole, the elastic resetting member being configured to constantly push the actuating rod in a direction running away from the second switch terminal.