Method and system for checking precision of electronic belt scale

The invention provides a method and system for checking precision of an electronic belt scale. The method comprises the following steps: in the process of balancing the scale with a standard code, collecting data containing scale frame length and weight and a belt speed by each electronic belt scale according to the principle of intra-group instant sampling and inter-group multiple sampling; according to the collected data and a preset flow of each feeding device, calculating basic data Y required by the precision check according to the following formula; calculating the ratio of an intra-group range average value to an inter-group range average value of the basic data; and comparing the calculated ratio with a preset threshold value so as to determine whether to repeat the precision check or end the precision check, wherein the formula is that Y=1-sigma{[(the actual flow i/the preset flow i-1)2]1/2*( the preset flow/a preset total flow)}*100%. By using the method, the existing problem that an enterprise can only check the accuracy of the online electronic belt scale but cannot check the precision is solved. The invention provides a convenient method for checking precision.