This invention relates to a method, a device and a system for realizing unified charging in the communication field, in which, the method includes: first of all, a user dials a unified charge access code to ask for charging and triggers said request to the charge proxy platform, which starts up the charge service logic and collects the charge information based on the received charge request to interact with the unified charge center and the SCP to finish the charge. This invention finishes the unified charge of integrated business runners.