The invention provides a pot lid and an electric heating apparatus. The pot lid comprises an upper cover (1), a locking cover (2) and a sealing ring (4), wherein the locking cover (2) is positioned below the upper cover (1); the sealing ring (4) is positioned below the locking cover; a lock structure (3) which can be matched with the upper cover (1) to act is arranged on the locking cover (2); the lower end of the lock structure (3) abuts against the sealing ring (4); the lock structure (3) can be jacked up by the sealing ring (4) and a liner together, and at the moment, the locking cover (2) can move relative to the upper cover (1); and when the sealing ring and /or the liner is forgotten to be arranged, the lock structure (3) cannot be jacked up, and at the moment, the locking cover cannot move relative to the upper cover. Only when the sealing ring and the liner are mounted to the right positions, the pot lid and the electric heating apparatus can normally work, otherwise, the pot lid and the electric heating apparatus cannot normally work, i.e., whether the sealing ring and /or the liner is forgotten to be arranged or not can be effectively detected, the safety and the reliability of normal work of the electric heating apparatus are improved, and the structure can also detect whether the size of the sealing ring and /or the liner is small or not.