An embodiment of the invention discloses a method for playing videos on a browser. The method comprises steps as follows: recognizing video formats of video files pointed by a video URL (uniform resource locator) when receiving the trigger operation for accessing the video URL displayed on the browser; inquiring video decoders matched with the video formats from a locally stored video decoding library; calling the video decoders to play the video files on the browser. An embodiment of the invention further discloses a device for playing the videos on the browser and a mobile terminal. With the adoption of the method and the device for playing the videos on the browser as well as the mobile terminal, the expansion capability of the browser for video playing is improved, and a user can use the browser more conveniently.