Payment webpage modification preventing method and device

The embodiment of the invention discloses a payment webpage modification preventing method and a payment webpage modification preventing device. The method comprises the following steps that whether a request received by a modification webpage interface is an external request or not is judged, and the external request refers to an inter-process request sent by other processes different from the webpage operating process; and when the judgment result shows that the request is the external request, the external request is intercepted. When the method and the device are adopted, the webpage tampering by trojan horse program can be avoided, and the goal of improving the e-commerce safety is reached.