The invention discloses a seismic transmission slot wave exploration method for a highly gassy mine, and the method comprises the steps: employing CO2 guns as transmission slot wave exploration seismic focuses of the highly gassy mine; installing a plurality of CO2 gun excitation drill holes in inner walls of a rail way at one side of a stope working face, and installing the CO2 guns in the CO2 gun excitation drill holes one by one; arranging a plurality of detectors side by side at equal intervals on inner walls of a belt way at the other side of the stope working face; starting a collectionmain unit to enable the CO2 guns to emit impact energy to the stope working face along the CO2 gun excitation drill holes; enabling the collection main unit to transmit the collected slot wave signalsof multiple vibrations to a computer, and enabling the computer to perform comprehensive analysis through combining with the onsite geological data, and finally completing the exploration of the transmission slot waves of the stope working face. The method can guarantee the vibration energy required by the transmission exploration of the stope working face, has the advantages of low-pressure explosion initiation, focus directing, controllable energy and reutilization, and is suitable for the exploration of the transmission slot waves of the stope working face of the highly gassy mine.