The invention provides a method and a device for loading data in a browser. The method includes the steps: triggering requests on a browser side to obtain instructions from mobile terminal data; receiving data coming from a preset mobile terminal device by a mobile terminal data reading interface on the browser side from a mobile terminal data transmission component; loading the data from the preset mobile terminal device on the browser side. By the method, the real-time performance and the accuracy of data acquired from the preset mobile terminal device can be greatly improved on the browser side, and data interaction functions of the browser side and the preset mobile terminal device are enhanced.