Referring to FIG. 2, preferably, the waterproof lid structure 200 of the present disclosure further comprises a magnet 250 and a decorative plate 260. A receiving chamber 221C is disposed at the joint portion 221 of the waterproof component 220. A magnet through-hole 211D is penetratingly disposed at the supportive sheet metal 211. The magnet 250 is received in the receiving chamber 221C and penetrates the magnet through-hole 211D so as to be held by the movable latch lid 230. Therefore, the magnet 250 works along with a detector (not shown) disposed in the opening 110 to detect whether the waterproof lid structure 200 is opened or shut. The decorative plate 260 is a slender plastic plate penetrated by a handle through-hole 261. The decorative plate 260 is engagingly disposed on the outer side of the movable latch lid 230. The handle 232 is protruded from the handle through-hole 261 and exposed from the decorative plate 260. Therefore, the decorative plate 260 conceals the passages 231, bolts 241 and resilient hook 234 to ensure the neat, visually pleasing appearance of the waterproof lid structure 200. Moreover, the handle 232 protruding from the handle through-hole 261 is easy to push by users.