The disclosure discloses a multi-core browser and a method for intercepting a malicious network address in a multi-core browser, wherein a malicious network address determining module is arranged in the multi-core browser. The method comprises: obtaining URL information of a webpage currently requested to be loaded; after determining a core for rendering the webpage to be loaded according to the URL information, initiating a request to the malicious network address determining module arranged at the multi-core browser side for judging whether a network address is a malicious network address; and intercepting loading access to a network address which is determined as a malicious network address at the multi-core browser side. The disclosure is capable of solving the problem that a terminal can not intercept a malicious network address accessed in the browser since no third-party device is installed on the terminal or when a third-party device is not started on the terminal; and achieving the beneficial effect of ensuring a timely and effective interception of a malicious network address.