Method for determining flatness of bulkhead surface

The invention provides a bulkhead surface flatness determination method, which comprises the following steps: S1, dividing a bulkhead surface into a plurality of areas according to a preset requirement, and obtaining actually measured height data of each area; s2, selecting an area to be calculated, setting an area range, and extracting multiple groups of areas in the set area range; s3, judging whether a blank area exists in each group of areas or not, and if the blank area exists in each group of areas, returning the flatness data of the to-be-calculated area to be 0; if no blank area exists in each group of areas or only a part of the group of areas have blank areas, removing the group with the blank area, calculating the difference value between each piece of straightness data and the actually measured height data of the area to be calculated by using a formula (2): = | B-(A + C)/2 |, and screening the maximum value in the difference values as the flatness data of the area to be calculated; and S4, repeat