The embodiments of the specification disclose an online data acquisition method and system, The method includes that: an acquisition terminal generates a first data acquisition module online according to a preset rule, and sends the first data acquisition module to multiple first target terminals; after receiving the first data acquisition module online, the multiple first target terminals feed back multiple pieces of first data online in first preset time, and return the multiple pieces of fed back first data to the acquisition terminal online; and the acquisition terminal performs online analysis based on the multiple pieces of received first data. According to the method provided in the application, it is ensured that survey is performed in real time, and a survey result may be analyzed without any delay.