The invention relates to the field of information collection, and specifically relates to a WeChat public number data collection method and device based on a browser. The method and the device are used for simultaneously opening a plurality of WeChat accounts by browser proxy settings, and monitoring and downloading interactive data packets of WeChat public numbers interacting with the Internet through the browser, when the browser interacts data with the Internet; one server can open a plurality of browser windows, which is equivalent to opening a plurality of collection inlets, but the resource occupancy of the browser windows is small; the collection pertinency is relatively strong, important WeChat public numbers are paid attention by the WeChat accounts, and the collected information contains no chaotic information; the access is not limited, after the browser logs in the WeChat, the public numbers will automatically push information; and the normal use of the WeChat accounts is not influenced, after logging in a web version, the WeChat accounts are used for collecting the information, and the WeChat accounts can be normally used at a mobile phone terminal.