Flood prevention water level gauge

The utility model discloses a flood prevention water level gauge, and belongs to the technical field of antennas. The flood prevention water level gauge comprises a metal cylinder, a plastic top cover, a PCB and an antenna structure, an installation space is defined by the metal cylinder and the plastic top cover, the PCB is arranged in the installation space, a non-clearance copper-clad area and a clearance radiation area used for installing the antenna structure are divided on the PCB, the clearance radiation area corresponds to the side wall of the plastic top cover, and the antenna structure is arranged in the non-clearance copper-clad area. The non-clearance copper-clad area is arranged corresponding to the metal cylinder, signals of the antenna structure can be radiated out through the side wall of the plastic top cover, shielding of the metal cylinder to the antenna is reduced, the performance of the antenna structure is improved, and stable transmission of signals of the flood prevention water level g