The invention discloses an automatic calculation method for detailed evaluation of scoring ranges in the bidding and evaluation process, and relates to a working method which applies a calculation method for index scoring ranges of bidding and evaluation scoring rubrics to an automatic calculation aid system for detailed evaluation of scoring ranges in bidding and evaluation based on statistical analysis of massive supplier qualification data. The automatic calculation system for the scoring ranges assists in generating scoring rubrics of bidding and evaluation, the mathematical and statistical analysis method of normal distribution stage algorithm is introduced, supplier qualification verification data are subjected to score range calculation, automatic generation of scoring ranges for scoring items is realized through a detailed evaluation management subsystem-a pre-bid management module of the bidding and evaluation aid system, data value is fully utilized, manual workload is reduced, and scientificity and objectivity of scoring range setting of scoring items are improved.