Water meter with filtering function

The water meter with the filtering function comprises an upper shell, a water meter body is installed on the top of the upper shell, when the water meter is assembled, a connecting cylinder is placed in the upper shell, a positioning ring enters a positioning groove in the upper shell, butt joint pipes on the two sides of the connecting cylinder are reset under the action of springs and enter butt joint grooves in a water pipe to be in butt joint, and the water meter body is installed on the upper shell. Meanwhile, a fixing block is attached to the water pipe, then a clamping block enters a clamping groove, the filter screen and all assemblies of the filter screen are preliminarily fixed at the moment, then the lower shell is pushed upwards to enable a screw to enter a through hole, when the lower shell is attached to the upper shell, a positioning ring enters a positioning groove in the lower shell, and then the whole can be fixed by rotating a fastening nut; and the limiting blocks move upwards, the bottoms