The invention discloses a multicell cooperative transmission method which comprises the following steps of: setting a cooperative transmission group; selecting a cell and a user for joining in the cooperative transmission group; when the quantity of cells to be cooperated is larger than zero, selecting a cell to be selected from the cells to be cooperated, confirming an orthogonal user group according to the channel state information reported by the user and adopting the user which enables the total throughput of the cooperative transmission group to be maximal after joining in the cooperative transmission group as a user to be selected; and finally, if the total throughput of the cooperative transmission group after the cell to be selected and the user to be selected are added into the cooperative transmission group is larger than the sum of the throughput of the cooperative transmission group and the cell to be selected when the cell to be selected does not join in cooperation, adding the cell to be selected and the user to be selected into the cooperative transmission group. By circularly executing the steps, the method can dynamically confirm more than one cooperative transmission group in a supercell for joining in cooperative transmission and achieve the aims of preventing intercell interference and maximizing supercell throughout.