The invention relates to a natural gas energy metering assignment checking method and system. The method comprises the steps that collected real-time production data of all stations are transmitted toa natural gas energy metering system database in a wireless and/or wired communication mode; the system database stores the received production data of each station and provides basic data for calculation assignment and check comparison; a fixed assignment calculation model or a variable assignment calculation model is provided through correlation analysis of an assignment station and an assignedstation, an assignment result is obtained, natural gas component parameters are conveyed to the assigned station, gas quality prediction is provided for a multi-gas-source mixed transportation user,and comparison data of online verification is provided; a metering station physical property calculation result is uploaded and is compared with an assignment calculation result in an assignment step,an error is calculated, and use performance of a metering device is evaluated online according to the error result; and different function authorities are set for different users. In the invention,integration of data calculation, assignment, verification and the like of the metering system is realized, and information sharing is realized too.