The present invention discloses a waterproof mechanism including a first casing, a second casing, a waterproof strip and a wire. The first casing includes a first frame. The second casing includes a second frame having a groove in which the waterproof strip is disposed. The wire is interposed between the first casing and the second casing and engaged with the first frame and the second frame, wherein the wire is pressed by the waterproof strip.