The invention discloses a data processing method in an internal and external network exchange platform environment. The data processing method comprises the following steps: receiving a first HTTP request from an external network user in real time; packaging the first HTTP request, encrypting the first HTTP request into a webservice protocol supported by an internal and external network exchange platform, and forming a second HTTP request; transmitting the second HTTP request into an intranet; unpacking and decrypting the second HTTP request, processing the original format and outputting a third HTTP request capable of being processed; performing a simulation request according to the request information of the third HTTP request to obtain return data corresponding to the third HTTP request; transmitting the return data to an extranet user; achieving data exchange between an internal network and an external network so that the safety of data transmission is improved, operation and maintenance management efficiency of merchants is greatly improved, and development cost is remarkably reduced.