A Balise Transmission Module, BTM, device of multiple information fusion and transmission between a host and an antenna unit, comprising a host unit, an antenna unit and a coaxial cable; the host unit (host), for generating a radio frequency energy signal, decoding a balise message and transmitting the balise message to a train operation transmission system; the antenna unit (Antenna unit), for transmitting radio frequency energy and transmitting uplink and downlink signals, wherein the coaxial cable (Coaxial cable), for connecting the host unit and the antenna unit through coaxial connectors on both ends thereof, and transmitting information between the host and the antenna unit; wherein, the host includes a host side filter circuit, for separating signals of different frequencies; and the antenna unit includes an antenna side filter circuit, for separating signals of different frequencies; wherein the host side filter circuit includes a filter 1 and a filter 2; the filter 1 performs high impedance to an energy signal, a balise message signal and a self-check signal, and performs low impedance to a self-check trigger signal, the self-check trigger signal being transmitted to the antenna unit through the filter 1; the filter 2 performs high impedance to the energy signal and the self-check trigger signal, the balise message signal and the self-check signal being decoded in the host after passing the filter 2, and the energy signal being directly transmitted to the antenna unit without passing the filter 1 and filter 2; wherein the energy signal transmits radio frequency energy being transmitted to a balise by the antenna unit for activating the balise to work; wherein the self-check signal transmits an uplink self-check signal from the antenna unit to the host for monitoring a working state of the antenna unit by the host; and wherein the self-check trigger signal, transmitted from the host to the antenna unit, triggers a self-check of the antenna unit. device of multiple information fusion and transmission between a host and an antenna unit, comprising a host unit, an antenna unit and a coaxial cable; the host unit (host), for generating a radio frequency energy signal, decoding a balise message and transmitting the balise message to a train operation transmission system; the antenna unit (Antenna unit), for transmitting radio frequency energy and transmitting uplink and downlink signals, wherein the coaxial cable (Coaxial cable), for connecting the host unit and the antenna unit through coaxial connectors on both ends thereof, and transmitting information between the host and the antenna unit; wherein, the host includes a host side filter circuit, for separating signals of different frequencies; and the antenna unit includes an antenna side filter circuit, for separating signals of different frequencies; wherein the host side filter circuit includes a filter 1 and a filter 2; the filter 1 performs high impedance to an energy signal, a balise message signal and a self-check signal, and performs low impedance to a self-check trigger signal, the self-check trigger signal being transmitted to the antenna unit through the filter 1; the filter 2 performs high impedance to the energy signal and the self-check trigger signal, the balise message signal and the self-check signal being decoded in the host after passing the filter 2, and the energy signal being directly transmitted to the antenna unit without passing the filter 1 and filter 2; wherein the energy signal transmits radio frequency energy being transmitted to a balise by the antenna unit for activating the balise to work; wherein the self-check signal transmits an uplink self-check signal from the antenna unit to the host for monitoring a working state of the antenna unit by the host; and wherein the self-check trigger signal, transmitted from the host to the antenna unit, triggers a self-check of the antenna unit.