The invention relates to a distribution center ex-warehouse rechecking method based on commodity weight. A standar deviation sigma k, a maximum Wmaxk, a minimum Wmink, the average weight of single samples of commodities and identification information and auxiliary information of the corresponding commodities are bound and stored in a database, and the weight WC of containers and corresponding container identification information and auxiliary information are stored in the database; an electronic picking form is issued from a warehouse management system, varieties, quantity and container identification information of the actual picked commodities are bound and stored in the database, the weight Wt of each picked commodity and the corresponding container identification information are bound and stored in the database, an automatic rechecking module obtains the container information of the picked commodities needing to be rechecked through a reader and calls out the relative information, calculating comparison and judgment are carried out, and if the picked commodities pass the recheck, bounding of the electronic picking form and the picked container identification is eliminated. Automatic rechecking is high in accuracy and quick, ex-warehouse efficiency of a distribution center warehouse is effectively improved, cost is low and the application range is wide.