The embodiments of the present application disclose a protocol conversion method, a protocol conversion platform and a protocol conversion gateway to reduce difficulty of information interaction between a superior data platform and a subordinate data platform. With the technical solution provided by the embodiments of the present application, the superior protocol conversion gateway and the subordinate protocol conversion gateway use signaling in compliance with the same third-party signaling standard, and the signaling interacted between the superior data platform and the subordinate data platform does not need to be switched between two video cascade protocols, which reduces the difficulty of developing a gateway, and facilitates the signaling interaction between the superior data platform and the subordinate data platform, and when a superior or subordinate data platform supporting a new video cascade protocol appears, it is only required to configure the superior protocol conversion gateway and the subordinate protocol conversion gateway without developing a new gateway, which further reduces workload of developing a gateway.