The utility model relates to a microcomputer parabolic weir communication flowmeter which belongs to a sewage flow quantity measuring instrument. The utility model is composed of a parabolic type flow quantity weir, a liquid level transmitter with high precision, a micro-computer control system, a modem, etc. The work principle of the utility model has the technical proposal the flow quantity is in direct proportion to the square of the height of the water level which overflows the weir; the water level is conversed into electrical signals by the liquid level transmitter with high precision, and the signals are input into a micro-computer control system to calculate, the datum such as instantaneous flow quantity, accumulative flow quantity, liquid level height, etc., can be displayed by a display circuit and are stored at one time per hour, the signals are timely conveyed to a host machine of the computer through the modem, and the computer makes and prints various report forms.