The invention discloses a real-time video transmission method based on an IP network. A transmitting end and a receiving end use a TCP protocol on a transmission layer to improve the reliability of data transmission; the receiving end is stored in a receive buffer zone by taking an image frame as the unit; the receive buffer zone is organized in an annular mode; a newest frame can be used for covering most outdated frame under the condition of slow treatment to keep the instantaneity of data; directshow/ gstreamer and the like serve as a multimedia framework; and the timestamp of the receiving end video frame is adjusted in real time according to the clock feedback of a display end. The invention takes the TCP protocol as the transmission layer protocol to effectively improve the reliability of video transmission, solve the problems of packet loss and disorder of network transmission and avoid the phenomenon that a decoder can not normally decode; the image information is stored in an annular buffer zone by taking the frame as the unit to effectively solve the problems of time delay and shake; a multimedia framework is used on the receiving end; according to the clock feedback of a display filter, the output video frame timestamp of the filter is adjusted in real time to ensure that the video can be smoothly played.