The present invention provides a video sectional loading method and device. The method comprises a step of calculating a loading speed in loading a first section of video according to the time information of loading the first section of video and the length of the first section of video, wherein the first section of video is obtained by dividing a preset video by a server, a step of calculating the length of a second section of video which is asked to be loaded to the server according to the remaining length of the first section of video and the loading speed of the first section of video, and a step of sending a request of loading the second section of video to the server according to the length of the second section of video, and a step of loading the second section of video divided from the preset video sent by the server for playing. According to the video sectional loading method and device, the length of the loaded video section can be automatically adjusted according to a real-time network state, a terminal and the server do not need to store video section information, the segmentation of the video in advance is not needed, the burden of the server is reduced, and a user experience is improved.