The double-layer well cover device includes a well wall, a cover seat installed on the upper part of the well wall, a circular filling between the well wall and the cover seat, a convex edge is arranged inside the cover seat, an inner tray is arranged on the upper part of the convex edge, an outer cover plate is arranged on the top of the cover seat, at least two positioning slots are arranged on the upper part of the convex edge, the inner disc is a basin structure, and a plurality of holes are arranged on the side wall The top of the outer cover plate is provided with a number of holes, the top of the outer cover plate is provided with a number of holes, and the inner surface is provided with a number of concentric stiffening rings
Preferably, a positioning convex block suitable for positioning the vertical groove is arranged on the peripheral surface of the outer rib plate ring.
The utility model has the ability of effectively preventing the well cover from being damaged or lost, and maintaining a clean and dry environment in the manhole after opening the manhole. For the convenience of personnel access to the manhole construction; for the drainage well cover, the function of making rainwater pass smoothly and reducing sludge and debris access.