The invention provides a data transmission method based on a multisource and multipath cooperative transmission control protocol. The method mainly comprises the steps that: MS-MPTCP connection is established between sub source equipment and a terminal; MS-MPTCP connection is established between the sub source equipment and a source; the source performs data communication with the sub source equipment through multiple paths by utilizing the MS-MPTCP connection; and the sub source equipment performs data communication with the terminal by utilizing the MS-MPTCP connection. By means of the data transmission method disclosed by the invention, under the condition that a few available IP interfaces of the terminal exist, the bandwidth also can be increased through the multiple paths as much as possible; therefore, the utilization rate of the network bandwidth is increased; the data transmission delay is reduced; the data transmission efficiency between the source and the terminal is increased; the source can push buffer cache data to the sub source equipment; the terminal also can obtain data from the sub source equipment; the problems of source memory consumption and prolonged waiting time due to too-large buffer cache data and packet out-of-order when massive data is transmitted through the multiple paths can be relieved; a sub source can obtain and control the congestion window of an access terminal; and thus, congestion control can be implemented more precisely.