The invention provides a method and a system for adjusting a screen display image and hiding a preview scroll bar. The method comprises: receiving a video signal sent by a television signal source, performing signal processing on the video signal and encoding the video signal to form a video data stream; determining whether the video data stream includes a scroll bar sequence frame; obtaining the playing position and the scroll bar attribute of the scroll sequence frame; collecting the screen attributes of a terminal device to generate a screen standard model; based on the screen standard model, translating the position of a video frame in the video data stream in the screen standard model according to the playing position and the scroll bar attribute; and packaging the video data stream into Internet Protocol (IP) data packets and sending the data packets to the terminal device for output playing. The method and the system can hide the preview scroll bar through translation of the video display interface according to a user's requirement and effectively prevent the preview content in the scroll bar from reducing the user experience of watching a program, thereby making the program watch more mysterious and improving the user's watching interest.