An electronic device and an airproof connector module thereof are provided. The electronic device is connected to a peripheral device by the connector module. The connector module includes a casing, an adapting board, a first connector, a second connector, a first elastic sealing element, and a second elastic sealing element. The adapting board is disposed in a containing space in the casing. The casing has a connection hole and an opening. The first connector is disposed at the connection hole, and the second connector is disposed at the opening. The first connector and the second connector are coupled to the adapting board. The first elastic sealing element fills space between the first connector and the connection hole. The second elastic sealing element fills space between the second connector and the opening.