The utility model relates to a cable theftproof well lid mainly solves the easy technical problem who is stolen of well lid, belongs to well lid technical field. It includes well lid, well seat, locking device and control system, locking device include mechanism's box and locking mechanism, locking device install mechanism's box in, locking mechanism includes advancing mechanism and spring bolt mechanism, spring bolt mechanism is located advancing mechanism's the outside, advancing mechanism include push rod, push rod housing and step motor, the push rod suit is in the push rod housing in, the push rod is hollow structure, the outer end of push rod is equipped with first permanent magnet, first permanent magnet is hollow structure, spring bolt mechanism include inserted bar, first socket and reset spring, control system includes single -chip module, intelligent trick lock module, first response module, second response alarm module, wireless?receiving module and wireless warning emission module. The utility model discloses effectively solve the well lid by the theft problem.