With the globalization and application of Internet technology in recent years, and the active introduction of relevant policies by the Chinese and Thai governments to develop cross-border e-commerce, the cross-border e-commerce market between China and Thailand has developed rapidly and has a excellent market prospect. This article analyzes the e-commerce market in Thailand under the background of RCEP, sorts out the development process and current situation of cross-border e-commerce between China and Thailand, identifies the problems that still exist in logistics, payment methods, tax regulations, laws and regulations, e-commerce talents and other aspects in the specific cooperation process, and proposes countermeasures and suggestions for the high-quality development of cross-border e-commerce between China and Thailand, in order to provide some reference for Chinese cross-border e-commerce enterprises to operate in the Thai market. China and Thailand should seize the development opportunities brought by the RCEP agreement, move towards the goal of mutual benefit and common development, and open up a new situation for the development of cross-border e-commerce between China and Thailand.