With the advancement of technology and the development of e-commerce, cross-border e-commerce has emerged as the times require, and two-dimensional barcodes have become an important technology in the overseas warehouse management mode of cross-border e-commerce. The purpose of this paper is to study the application of twodimensional barcode technology in cross-border e-commerce overseas warehouses based on the Internet of Things. After reading and referring to a large number of materials, the brief development history, basic technical architecture, main features and prospects of the application of QR code identification technology in the Internet of Things and automatic identification technology are studied in detail. How code identification technology works in the IoT supply chain and details its linkages. At the same time, the application of the automatic identification technology of the Internet of Things in the overseas warehouse of cross-border e-commerce is analyzed. The experimental results show that QR code recognition can be well applied to overseas warehouses of cross-border e-commerce