Water meter based on air vapor erosion prevention technology

The present invention discloses a water meter based on air vapor erosion prevention technology. The water meter comprises a lower shell and an upper shell, the lower shell is of a box structure with an opening in the top end, the left end and the right end of the lower shell penetrate through connecting pipe holes respectively, a water meter body is arranged in an inner cavity of the lower shell,and a dial plate is embedded in the top end of the water meter body; a water outlet pipe and a water inlet pipe which are matched with the pipe holes are connected to the left end and the right end ofthe water meter body in a penetrating mode respectively, an observation window matched with the dial plate is connected to the top end of the upper shell in a penetrating mode, the observation windowcorresponds to the dial plate in the vertical direction, and a window plate is arranged in the observation window; a clamping cavity matched with the lower shell is formed in the bottom end of the upper shell; and the clamping