The invention discloses an omni-channel cloud ERP comprehensive management system, including POS sales, micro stores and background ERP management system. The background ERP management system includes: OA workbench, organization management module, commodity catalog management module, price management module, purchase and warehousing management module, inventory management module, warehouse management module, distribution management module, retail management module, member stored value module, report management module, financial management module, catering management module, WeChat management module, online shopping management module, The three-party order management module and the micro-store management module, each module is connected and communicates with each other; the new SaaS model, multiple application service clusters, database clusters, data interface API and other open source technologies are adopted to effectively improve the integration and application of enterprise informationization , reduce input and use costs.